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  Leica Lenses original brochure from 1951
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  "Identifying Leica Lenses" by Ghester Sartorius, 1999
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  NIKON SERIES E 50 mm F/1.8 LENS MANUAL
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  CANON INTERCHANGEABLE FD LENS MANUAL & BONUS
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  User manual: Nikon Nikkor-P auto 55mm f/3.5 f3.5 #836
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  ASAHI PENTAX SMC Pentax Lenses Manual Guide 08/1979
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  PENTAX SMC Pentax Lenses Manual Guide 01/1981
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  PENTAX Lenses And Accessories Manual Guide 09/1983
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