TY  - RPRT
TI  - Map of east-central South Dakota showing area, underlain by more than 25 feet of stratified sand and gravel
AU  - J.R. Jones
PY  - 1956
DO  - 10.3133/ofr5664
UR  - https://pubs.usgs.gov/publication/ofr5664
ID  - ofr5664
ER  -