Medical subject headings - tree structures, 1977 /
Medical Subject Headings Section, Library Operations, National Library of Medicine.

APA Citation

National Library of Medicine (U.S.). (1976). Medical subject headings - tree structures, 1977. Bethesda, Md.: The Library.

MLA Citation

National Library of Medicine (U.S.). Medical Subject Headings - Tree Structures, 1977. Bethesda, Md.: The Library, 1976.

Warning: These citations may not always be complete (especially for serials).