TY  - BOOK
TI  - McGraw-Hill Encyclopedia of Science and Technology
U1  - 503 
PY  - 1971///
CY  - New York
PB  - McGraw-Hill
KW  - Ciencia
KW  - Diccionarios
KW  - Tecnología
N1  - - - Yearbook 1970-71; 1971; 1972; 1973 - - Readers'guide - - Study guide
ER  -