TY  - RPRT
TI  - Thirteenth Annual report of the United States Geological Survey to the Secretary of the Interior, 1891-1892: Part 2. Geology
AU  - J. W. Powell
PY  - 1893
DO  - 10.3133/ar13_2
UR  - https://pubs.usgs.gov/publication/ar13_2
ID  - ar13_2
ER  -