Cohn, Norman S. Elements of cytology / Norman S. Cohn. - 2d ed. - New York : Harcourt, Brace & World, 1979 - xvi, 495 p. : ill. ; 24 cm. Includes bibliographies and index. Subjects--Topical Terms: Cytology. Dewey Class. No.: 571.6 / COE 1979