Manufacturers' links
   • Zeiss Ikon Web site
   • Carl Zeiss AG
   • Cosina (Japan)
   • Hasselblad

Internet discussions
These groups are free but require registration, which helps to keep out spammers. Some of the sites accept donations.
 

• Nelsonfoto.com    • Rangefinderforum.com    • Analog Photography Users Group

• The Camera Collector     • Zeiss Ikon collector's group on Yahoo     • photo.net

Books on Zeiss Ikon AG history and classic cameras
   • "Zeiss Ikon 1926-1939," by D.B.Tubbs, Hove Collectors Books
   • "Zeiss Compendium East and West – 1940-1972," by Charles M. Barringer and
     Marc James Small, Hove Collectors Books
   • "Collecting and Using Classic Cameras," by Ivor Mantanle, Thames & Hudson
   • "On The Trail of the Contax / Volume II: Contax History From 1945 Until Today,"
      by Hans-Jurgen Kuc

Miscellaneous links
   • Zeiss Historica Society
   • Cameraquest
   • Pacific Rim Camera
   • Photoethnography

Film processing
I'm going to try to maintain a list of high-quality mail-order film processing companies. If you have any to recommend, send me a note.
 
   • ABC Photo Lab, Mystic, Conn., (800) 572-0212, ext. 105
   • A&I Photo, Hollywood, Ca., (888) 666-5199
   • Dan's Camera City, Allentown, Pa., (610) 434-2313
   • Flair Pro Color Lab, Gainesville, Fla. (800) 741-6004
   • Rochester Photographic, Rochester, N.Y., (585) 461-2312
   • Specialty & Color Services, Santa Barbara, Ca., (805) 965-1832
   • Specialty Photographic Laboratories, Santa Barbara, Ca., (800) 207-7927