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Frank BenfordIntegrating Factor of the Photometric Sphere, October 1935, No. 769 Schenectady General Electric Company Research Laboratory 1935 Paperback Used: Good pp. 332-39; Reprint from The Journal of the Optical Society of America; I am uploading 16 of these; they are all in good condition overall; no marks; there is an archive number stamp on the top left of each study; 11.5 x 8.5 inches; mild shelfwear; Will deal for the load of them, General Electric Company Research Laboratory Price: