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165. National Library of Medicine classification: a scheme for the shelf arrangement of books in the field of medicine and its related sciences

167. National Library of Medicine classification: a scheme for the shelf arrangement of books in the field of medicine and its related sciences

169. National Library of Medicine classification: a scheme for the shelf arrangement of library materials in the field of medicine and its related sciences

170. National Library of Medicine classification: a scheme for the shelf arrangement of library materials in the field of medicine and its related sciences