TY  - RPRT
TI  - Eleventh Annual report of the Director of the United States Geological Survey, Part 1-Geology: 1889-1890
AU  - J. W. Powell
PY  - 1891
DO  - 10.3133/ar11_1
UR  - https://pubs.usgs.gov/publication/ar11_1
ID  - ar11_1
ER  -