Main heading-subheading combinations : MEDLARS indexing instructions MEDLARS indexing instructions Goto, Keiji. MEDLARS Abstracting and Indexing as Topic Subject Headings [Bethesda, Md.] : National Library of Medicine, Index Section, 1970 National Library of Medicine (U.S.). Index Section. Text 59 leaves nlm:nlmuid-0226512-bk 0226512 http://resource.nlm.nih.gov/0226512 English The National Library of Medicine believes this item to be in the public domain : https://creativecommons.org/publicdomain/mark/1.0/