TY  - BOOK
ED  - National Science Foundation
TI  - Specialized science information services in the United States ; a directory..
T2  - NSF 61-68
U1  - 506 
PY  - 1961///
CY  - Washington
PB  - Office of Science Information Service
KW  - BiologÃ­a
KW  - Sociedades
KW  - Directorios
KW  - FÃ­sica
KW  - Instituciones cientÃ­ficas
ER  -