TY  - BOOK
AU  - Esterer,Arnulf K
TI  - Tools: shapers of human progress 
U1  - 621.908 
PY  - 1969///
CY  - Greenwich, CT.
PB  - Fawcett
KW  - Herramientas
KW  - Historia
N1  - Tít. orig. : Tools: shapers of civilization
ER  -