TY  - RPRT
TI  - Images of the U.S. Geological Survey, 1879-1979
AU  - E. L. Yochelson
AU  - C.M. Nelson
PY  - 1979
DO  - 10.3133/70039523
UR  - https://pubs.usgs.gov/publication/70039523
ID  - 70039523
ER  -