TY  - BOOK
AU  - Yochelson,E.L.
AU  - Nelson,C.M.
TI  - Images of the U.S. geological survey, 1879-1979
U1  -  551.70973 
PY  - 1979///
CY  - Arlington
PB  - United States Geological Survey
KW  - Geology, Stratigraphic
KW  - United States
KW  - Geology
ER  -