TY  - RPRT
TI  - General geology of the Harold D. Roberts Tunnel, Colorado
AU  - Charles Sherwood Robinson
AU  - Lawrence Allen Warner
AU  - Ernest Eugene Wahlstrom
PY  - 1974
DO  - 10.3133/pp831b
UR  - https://pubs.usgs.gov/publication/pp831B
ID  - pp831B
ER  -