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

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

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

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