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

nlm:nlmuid-100901931-bk

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

nlm:nlmuid-0101314-bk

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

nlm:nlmuid-9440818-bk