TY  - RPRT
TI  - Preliminary map showing the thickness and character of Quaternary sediments in the United States east of the Rocky Mountains
AU  - D. R. Soller
PY  - 1993
DO  - 10.3133/ofr93543
UR  - https://pubs.usgs.gov/publication/ofr93543
ID  - ofr93543
ER  -