TY  - RPRT
TI  - Geologic mapping of tunnels using photogrammetry--control-point configuration
AU  - Jeffrey A. Coe
AU  - Keld S. Dueholm
PY  - 1991
DO  - 10.3133/ofr9037
UR  - https://pubs.usgs.gov/publication/ofr9037
ID  - ofr9037
ER  -