TY  - BOOK
TI  - Survey of metallic and non-metallic minerals, phase 2: republic of Ecuador 
T2  - Technical report, 16
PY  - 1972///
CY  - New York
PB  - United Nations development programme
KW  - Géologie régionale
KW  - Minéralisation
KW  - Gîte polymétallique
KW  - Equateur
KW  - Azuay
KW  - Angas
N1  - bibliogr. p. 19, 3
ER  -