Allen, Roy Morris, 1882- Photomicrography [by] R. M. Allen. - New York : D. Van Nostrand Company, inc., 1941. - viii, 365 p. : incl. illus., L pl. on 25 l., diagrs. ; 24 cm. Subjects--Topical Terms: Photomicrography.--------Microphotography.-------- Dewey Class. No.: 578.46 ALL