TY  - RPRT
TI  - Preliminary geochemical study of ash-flow tuffs in the Morococala and Los Frailes volcanic fields, central Bolivian tin belt
AU  - G. E. Ericksen
AU  - R. L. Smith
AU  - R. G. Luedke
AU  - Mario Flores
AU  - Alfredo Espinosa
AU  - Fernando B. Urquidi
AU  - Fernando Saravia
PY  - 1985
DO  - 10.3133/ofr85258
UR  - https://pubs.usgs.gov/publication/ofr85258
ID  - ofr85258
ER  -