TY  - RPRT
TI  - Isopach and structure contour mapping of thin bentonite and shale beds in an area of mapped lineaments, central South Dakota
AU  - A.F. Chleborad
PY  - 1986
DO  - 10.3133/ofr86414
UR  - https://pubs.usgs.gov/publication/ofr86414
ID  - ofr86414
ER  -