TY  - RPRT
TI  - Geological and geochemical reconnaissance in the central Santander Massif, Departments of Santander and Norte de Santander, Colombia
AU  - James George Evans
PY  - 1976
DO  - 10.3133/ofr77281
UR  - https://pubs.usgs.gov/publication/ofr77281
ID  - ofr77281
ER  -