TY  - BOOK
AU  - National Academy of Sciences,Washington
TI  - Scientific and technical societies of the Unated States. 8ed
PY  - 1968///
CY  - Washington - EEUU
PB  - 
KW  - Ciencias
KW  - Sociedades tecnicas
KW  - Estados Unidos
KW  - Academia de Ciencias
ER  -