TY  - RPRT
TI  - Exploration of the Colorado River of the West and its tributaries: Explored in 1869, 1870, 1871, and 1872, under the direction of the Secretary of the Smithsonian Institution
AU  - John Wesley Powell
PY  - 1875
DO  - 10.3133/70039238
UR  - https://pubs.usgs.gov/publication/70039238
ID  - 70039238
ER  -