TY  - RPRT
TI  - Geologic field photograph map of the Grand Canyon region, 1967–2010
AU  - George H. Billingsley
AU  - Gregory Goodwin
AU  - Sarah E. Nagorsen
AU  - Monica E. Erdman
AU  - Jason T. Sherba
PY  - 2019
DO  - 10.3133/gip189
UR  - https://pubs.usgs.gov/publication/gip189
ID  - gip189
ER  -