TY  - BOOK
TI  - Survey of metallic and non-metallic minerals, phase 2: republic of Ecuador 
T2  - Technical report, 12
PY  - 1972///
CY  - New York
PB  - United nations development programme
KW  - Géochimie
KW  - Géologie économique
KW  - Géophysique
KW  - Equateur
KW  - Azogues
KW  - San Miguel
N1  - bibliogr. p. 17, 4
ER  -