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page 10 from Raymond Davis and F. M. Walters, Jr., Scientific Papers of the Bureau of Standards, No. 439 (Part of Vol. 18) "Sensitometry of Photographic Emulsions and a Survey of the Characteristics of Plates and Films of American Manufacture," 1922.

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(del) (cur) 02:06, 5 July 2006 . . Dicklyon (Talk | contribs) . . 471×813 (42,351 bytes) (page 10 from Raymond Davis and F. M. Walters, Jr., ''Scientific Papers of the Bureau of Standards'', No. 439 (Part of Vol. 18) "Sensitometry of Photographic Emulsions and a Survey of the Characteristics of Plates and Films of American Manufacture," 1922.)