TY  - RPRT
TI  - Gypsum-karst collapse in the Black Hills, South Dakota-Wyoming, USA
AU  - Jack B. Epstein
PY  - 2016
DO  - 10.3986/ac.v29i2.452
UR  - https://pubs.usgs.gov/publication/70231228
ID  - 70231228
ER  -