TY  - RPRT
TI  - Geologic Map of the San Luis Hills Area, Conejos and Costilla Counties, Colorado
AU  - Ren A. Thompson
AU  - Michael N. Machette
PY  - 1989
DO  - 10.3133/i1906
UR  - https://pubs.usgs.gov/publication/i1906
ID  - i1906
ER  -