TY  - BOOK
AU  - Lefond,Stanley J.
TI  - Industrial minerals and rocks: Nonmetallics other than fuels 
SN  - 0-89520-402-9
AV  - TN263 I53 1983
PY  - 1983///
CY  - New York
PB  - Society of mining engineers, American institute of mining, metallurgical, Petroleum engineers
KW  - Geología económica
KW  - Minas y riquezas minerales
ER  -