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Tower 45 (1957) - mike eckman dot com
Leitz and Leica Lens Compendium & Leica Serial Numbers - Thorsten Overgaard's Leica Photography Pages
Leica Lens Compendium E. Puts 2005 D. D. Teoli Jr. A. C. : D.D. Teoli Jr. A.C. : Free Download, Borrow, and Streaming : Internet Archive
Review: Leica APO-Elmarit-R 2.8/180 - phillipreeve.net
Leica Releases Summilux-M 90mm f/1.5 ASPH | La Vida Leica!
LEICA Reviews
Leica Lens Compendium E. Puts 2005 D. D. Teoli Jr. A. C. : D.D. Teoli Jr. A.C. : Free Download, Borrow, and Streaming : Internet Archive
Leica Lens Compendium : Puts, Erwin: Amazon.nl: Books
Leica Camera Serial Numbers: A Database & List of 1707 cameras - Red Dot Camera
Announcing the Ricoh GR (Digital V) – Ming Thein | Photographer
WOSIMs Photography - 02. Leica 28mm - 35mm lens reviews
Farewell Erwin Puts: One of the world's foremost Leica experts dies at 77 - Macfilos
WOSIMs Photography - 03. Leica 40mm - 50mm - 60mm lens reviews
Leica Lens Compendium: Puts, Erwin: 9781897802175: Amazon.com: Books
The Online Photographer: Erwin Puts is Gone
Leicaflex (1964) - mike eckman dot com
The Online Photographer: 'The Leica Compendium' by Erwin Puts
Fisheye lens - Wikipedia
Leica M mount - Wikiwand
LEICA M-Lens Compendium
Read this before you buy a Soviet camera - Kosmo Foto
