21. National Library of Medicine classification, scheme for shelf list arrangement of books in field of medicine and its related sciences; [prepared by Emilie Wiggins]. 3d edition (with 1969 supplementary pages added). Bookmark Corporate/Agency Authors: National Library of Medicine and Health, Education and Welfare Dept. Publisher: National Library of Medicine Date: [Revised 1969.] [1969.] SuDoc number: HE 20.3602:C 56/969