TY  - BOOK
TI  - Survey of metallic and non-metallic minerals: Coal investigations 
T2  - Technical report, 1
PY  - 1969///
CY  - New York
PB  - United nations development programme, Ministry of industries and commerce-National geological and mining service
KW  - Géologie régionale
KW  - Stratigraphie
KW  - Charbon
KW  - Géologie économique
KW  - Equateur
KW  - Azuay
KW  - Cuenca
KW  - Cañar
KW  - Biblián
KW  - Loja
N1  - bibliogr. p. 54-56, 5
ER  -