Antiques   hallmarks/maker’s marks/silver marks encyclopedia
   AADLA   antiques/fine arts organization
   ACMOC   Antique Caterpillar Machinery Owners Club
   Antique Radios   vintage radio collecting
   Antiques and the Arts   antiques/arts trade
   Antiques Trade Gazette   antique/art news
   ASCAS   antique silver collectors association
   Atwater Kent Radio   Atwater Kent radios information   washing machines   carpet encyclopedia
   DATAMP   American machinery/tool patents directory
   EnginAds   advertising pages for antique engines
   Farm Collector   vintage farm equipment
   Friends of Ferguson Heritage   Harry Ferguson tractors   antique Chinese/Japanese porcelain

   InstAppraisal   antique/art/collectible appraisals
   ISRM   slide rules   carpets/rugs
   Kovels   antique/collectibles price guide
   Library of Congress   research library   crystal/tube radios   tractor forums
   Nostalgia Air   antique/vintage radio references   old engines   antique/used woodworking tools   Philco radios
   Phil’s Old Radios   antique radios
   Preston Services   steam engines suppliers
   Prices4Antiques   antiques/collectibles auction prices database
   Red Star Radiosite   Soviet antique radio gallery

   RedSquare   Wheel Horse forum   antique rugs/carpets/textile arts marketplace
   Scott Antique Markets   antique show
   Shorpy   vintage photography blog   antique silver collection
   Smokstak   antique engines
   TEFAF   antiques/art/design fair
   The Ferguson Club   Ferguson tractor owners club
   The Textile Museum   textile museum
   The Typewriter Database   typewriter serial number information
   The Valve Museum   valves
   The Valve Page   vintage televisions/tube radios collection   Stoke-on-Trent potteries
   TMC   textile museum
   Tractor Forum   online tractor community/resource

   Tractor Shed   antique/vintage tractors
   Vacuumland   vacuum cleaners   phonographs
   Vintage Tractor Engineer   vintage tractor maintenance/repair tutorials
   Yesterday’s Tractors   antique tractor parts


   Aero-News Network   aerospace/aviation news
   Aeromodelling GR   aeromodelling in Greece
   AIN   Aviation International News
   Air & Space   aviation/flight technology magazine
   Air Sports Net   aviation news/weather   reference site for aircraft/airline fleets
   Airliners   aircraft photo database/aviation forum
   AOPA   Aircraft Owners and Pilots Association
   AvCom   aviation discussions
   Aviation Week   news service for aerospace/aviation/space industries
   Avionics   avionics industry analysis/news
   AVweb   aviation news   Boeing 737 Technical Site
   BALPA   British Airline Pilots’ Association
   Boeing   aerospace/defense company

   CAA   Civil Aviation Authority   Chinese civil aviation web portal
   CASA   Civil Aviation Safety Authority
   Cessna   general aviation aircraft manufacturer
   Cirrus Aircraft   aircraft manufacturer
   Cross Country   hang gliding/paragliding/paramotoring magazine
   DGCA India   national civil aviation authority of India
   DHV   German hang gliding/paragliding association   skydiving community
   EAA   Experimental Aircraft Association
   FAA   Federal Aviation Administration
   FAI   World Air Sports Federation
   Flightradar24   global flight tracking service
   FLYER   general aviation magazine
   General Aviation News   newspaper covering general aviation

   Heliguy   drone retailer in UK   homebuilt aircraft discussion forum
   ICAO   International Civil Aviation Organization
   Kent Gliding Club   gliding club in UK   live audio feeds of air traffic communications
   MiGFlug   aviation/space adventure company
   MILAVIA   military aviation website
   NAV CANADA   Canada’s air navigation service provider
   NTSB   National Transportation Safety Board
   Plane & Pilot   information source for general aviation pilots   civil aviation database   radio-controlled model articles/forums/market
   Red Bull X-Alps   paragliding race
   Royal International Air Tattoo   military air show
   SACAA   South African Civil Aviation Authority

   Skydive Arizona   skydiving center
   Skydive Perris   skydiving center
   SkyVector   aeronautical charts/flight planning
   Trade-A-Plane   aviation marketplace
   XContest   online hang gliding/paragliding contest


   Audio Geek Zine   music production articles
   Audio Ideas Guide   hi-fi/home theater magazine
   Audiofanzine   music gear news/reviews
   Audioholics   online audio/video magazine
   Audiokarma   home audio stereo discussion forums
   Audiophilia   online audiophile journal   home music production tutorials
   AudioReview   audio component review site   audio/video hardware archive
   Chris VenHaus   DIY resource for audiophiles
   Classic Speaker Pages   classic speakers information
   DIY Audio Projects   DIY audio project collection
   DIY Audio Projects   DIY audio blog   subwoofer DIY   audiophile equipment reviews   pro audio community
   Head-Fi   headphone news/reviews   KEF speakers forum/information
   Home Brew Audio   audio recording lessons
   Home Studio Corner   music production tutorials   music recording forum
   Hometracked   home recording/project studio blog
   Humble Homemade Hifi   loudspeaker projects   tube amplifier projects
   LA Audio File   audio equipment reviews
   Lansing Heritage   history of audio engineer James B. Lansing   MiniDisc community portal   Nakamichi cassette deck resource
   Pass DIY   amplifiers/loudspeakers/preamplifiers projects
   Positive Feedback   audio arts forum

   Pro Audio Files   tutorials on mastering/mixing/producing music
   Production Advice   music production advice
   RecordingHacks   audio recording news
   Remote Central   universal remote control reviews
   Roger Russell   information/photos of McIntosh equipment   Sansui classic audio/vintage stereo information
   Sonic State   music technology news/reviews
   Stereo Times   audiophile magazine
   Stereophile   high-end audio magazine   subwoofer DIY   transmission line speaker information
   The Analog Dept.   vinyl LP hardware information
   The Big Picture   music production blog
   TNT-Audio   hi-fi audiophile magazine   audio/music magazine

   Tuner Information Center   vintage stereo tuners information
   UCSB Cylinder Audio Archive   cylinder recording archive
   UHF Magazine   high fidelity magazine
   Zaph Audio   DIY speaker projects


   470 Sailing   International 470 Class Association
   ANSA   Annapolis Naval Sailing Association
   ASA   American Sailing Association
   Boat   superyacht guide   boating education courses   boat building/design site   online boating safety courses/exams
   Boating   powerboat magazine   boat reviews/tests
   BoatUS   American association of boat owners
   BSC   Budworth Sailing Club
   Canal & River Trust   charity responsible for maintaining waterways in England and Wales
   Cannes Yachting Festival   boat show
   Crewseekers   sailing yacht crew agency
   Cruising World   sailing magazine

   Equasis   Electronic Quality Shipping Information System   international online boat/crew network
   iBOATS   boating forum
   Latitude 38   sailing magazine for Northern California
   Le Boat   boating vacation company
   Locaboat Holidays   canal boat hire in Europe
   Mariners’ Museum   maritime museum   planning site for cruisers
   OARS   adventure travel company   International Optimist Dinghy Association
   ORC   world governing body for offshore sailboat racing
   PassageMaker   cruising magazine
   Power & Motoryacht   magazine for powerboat owners
   Practical Boat Owner   British yachting magazine
   Practical Sailor   boats/sailing gear reviews

   PWCToday   personal watercraft discussion forum
   RYA   Royal Yachting Association
   Sail   sailing magazine
   Sail-World   sailing news network
   Sailing Anarchy   sailboat racing e-zine
   Sailing World   performance sailing magazine
   Saône Bateaux   houseboat rental in Burgundy, France
   Scream And Fly   performance boating online community/magazine
   SCYC   South Caernarvonshire Yacht Club
   SpinSheet   Chesapeake Bay sailing magazine
   USPS   nonprofit educational boating safety organization
   Whitewater Guidebook   information about whitewater kayaking/rafting
   Wilderness Aware Rafting   Colorado whitewater rafting trips
   Wildwater   rafting/ziplining in southeastern US
   World Sailing   world governing body for sailing

   Yachting World   sailing/yachting magazine   sailing news   motorboating/yachting news
   Zoar Outdoor   rafting/ziplining in New England


   Acura   luxury vehicle manufacturer
   Audi   luxury vehicle manufacturer
   Audi USA   luxury vehicle manufacturer
   AudiWorld   Audi forums/news
   Autoblog   car news/reviews   online automotive catalog
   autoevolution   automotive news/car reviews
   Autoweek   car culture magazine
   BMW   luxury/performance vehicle manufacturer
   BMW USA   luxury/performance vehicle manufacturer
   Car and Driver   automotive enthusiast magazine
   CarBuzz   car news/reviews
   Carscoops   car news
   Chevrolet   automobile manufacturer
   Chrysler   automobile manufacturer

   ClubLexus   Lexus forums/news
   Dodge   automobile manufacturer
   Ford   automobile manufacturer
   General Motors   automobile manufacturer
   GMC   truck/utility vehicle manufacturer
   Honda   automobile/motorcycle/power equipment manufacturer
   Honda Automobiles   Honda automobile sales information
   HowStuffWorks Auto   explanations of auto accessories/equipment/parts
   Hyundai   automobile manufacturer
   Jaguar   luxury vehicle brand
   Jalopnik   automotive culture/car news
   Jeep   off-road/sport utility vehicle manufacturer
   Lamborghini   luxury sports car manufacturer
   Lexus   luxury vehicle manufacturer
   Mercedes-Benz   luxury vehicle manufacturer

   Motor Authority   auto news
   Motor Trend   automobile magazine
   NASIOC   North American Subaru Impreza Owners Club   car pictures/wallpapers
   NHTSA   National Highway Traffic Safety Administration
   Nissan USA   automobile manufacturer
   Peugeot   automobile manufacturer
   Popular Mechanics   popular science/technology magazine
   Porsche   high-performance sports car manufacturer
   Renault   automobile manufacturer   Porsche enthusiast site
   Road & Track   automotive enthusiast magazine
   Speedhunters   car tuning weblog
   Subaru   automobile manufacturer
   Suzuki   automobile/motorcycle manufacturer

   The Car Connection   car review site
   Top Gear   automobile magazine
   Volkswagen   automobile manufacturer
   Volvo   Swedish luxury vehicles company
   Vwvortex   Volkswagen enthusiast website


   10,000 Birds   birding blog
   ABA   American Birding Association
   ABA Birding News   birding news
   ABC   American Bird Conservancy
   ABC   African Bird Club
   All About Birds   bird guide
   Bird Watcher’s Digest   birding magazine
   BirdForum   online birding community
   BirdGuides   bird news
   BirdLife Australia   bird conservation/research organisation in Australia
   BirdLife Switzerland   bird conservation group in Switzerland
   BirdNote   podcast/radio show about birds
   Birds of North America   encyclopedia of bird species in Canada/US   birding website
   BOU   British Ornithologists’ Union

   British Bird Lovers   information about bird watching/garden birds in UK
   British Garden Birds   British garden bird guide
   BSC   Bird Studies Canada
   BTO   British Trust for Ornithology
   Carolina Raptor Center   raptor conservation organization
   Cornell Lab of Ornithology   bird conservation/research institute
   Ducks Unlimited Canada   waterfowl habitat conservation organization
   Dutch Birding   ornithological magazine
   eBird   online database of bird observations
   Fugle og Natur   Danish nature site   birds/wildlife photography
   HKBWS   Hong Kong Bird Watching Society   online resource about hummingbirds   North Carolina Wildlife Resources Commission
   NestWatch   nesting bird monitoring program

   OBI   Oriental Bird Images
   Operation RubyThroat   website about attracting/studying hummingbirds
   Optics4Birding   bird watching equipment store   French birdwatching/ornithology website
   RSPB   Royal Society for the Protection of Birds
   Rutland Ospreys   Rutland Osprey Project online
   Scottish Seabird Centre   seabird conservation/education charity   information/photographs about South Dakota birds
   Sialis   information about bluebirds
   Sibley Guides   identification of North American birds/trees
   Skye Birds   Skye birding guide
   SOS   Sussex Ornithological Society   wildlife rehabilitation organization in Newark
   Tucson Audubon Society   bird conservation organization in Arizona
   USGS PWRC MBR   North American bird population change information   bird identification guide
   Wildlife Acoustics   bioacoustics monitoring systems
   WWT   wetland/wildfowl conservation charity in UK
   xeno-canto   bird sound database