TY  - RPRT
TI  - Preliminary bedrock-surface map of the Omaha-Council Bluffs area, Nebraska-Iowa
AU  - Robert D. Miller
PY  - 1957
DO  - 10.3133/ofr5773
UR  - https://pubs.usgs.gov/publication/ofr5773
ID  - ofr5773
ER  -