TY  - RPRT
TI  - Bedrock-surface altitude in the midwestern basins and arches region of Indiana, Ohio, Michigan, and Illinois
AU  - Danny W. Bunner
PY  - 1993
DO  - 10.3133/wri934050
UR  - https://pubs.usgs.gov/publication/wri934050
ID  - wri934050
ER  -