Bibliography

For cameras information I consulted:

Zeiss Ikon Cameras 1926-39
By D.B.Tubbs - Hove collectors books - ISBN 1-874707-01-4

Zeiss Compendium East and West 1940-1972
By Charles M. Barringer and Marc James Small - Hove collectors books - ISBN 1-874707-24-3

Collecting and using Classic Cameras
By Ivor Matanle - Thames and Hudson - ISBN 0-500-27656-0

McKeown's price to antique & classic cameras 1995-1996
By James M McKeown's and Joan C McKeown's- Centennial Photo Service - ISBN 0-931838-21-5

The Negative
By Ansel Adams - Little, Brown and Company - ISBN 0-8212-2186-8