TY  - BOOK
ED  - Library of Congress.
TI  - Classification. Class Q, Science
SN  - 0844406317
U1  - 025.465 
PY  - 1989///
CY  - Washington
PB  - Library of Congress, 
KW  - CLASIFICACION
KW  - BIBLIOGRAFIAS
KW  - LIBROS
ER  -