TY  - RPRT
TI  - La Plata folio, Colorado
AU  - Whitman Cross
AU  - Arthur Coe Spencer
AU  - Chester Wells Purington
PY  - 1899
DO  - 10.3133/gf60
UR  - https://pubs.usgs.gov/publication/gf60
ID  - gf60
ER  -