TY  - BOOK
TI  -  Medical subject headings. Tree structures
U1  -  REF 025.47 MED 
CY  -  Bethesda, Md. : 
PB  -  Medical Subject Headings Section, Library Operati ons, National Library of Medicine.
KW  -  Subject headings
KW  -  Medicine
KW  -  Periodicals
KW  -  Classification
KW  -  Periodicals.
ER  -