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3. Prospect sources

nlm:nlmuid-58221110R-bk

9. 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

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

nlm:nlmuid-0226441-bk