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  1. Medical Subject Headings : supplementary chemical records (1993) 9.91 
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  2. Medical Subject Headings : tree structures (1993) 9.91 
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  3. National Library of Medicine Classification : a scheme for the shelf arrangement of books in the field of medicine and its related sciences (1981) 9.91 
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  4. National Library of Medicine Classification Schedule (1994) 9.91 
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  5. Medical Subject Headings : annotated alphabetic list (1993) 9.91 
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