TY  - RPRT
TI  - Formation of regolith-collapse sinkholes in southern Illinois: Interpretation and identification of associated buried cavities
AU  - S.V. Panno
AU  - C.P. Wiebel
AU  - P.C. Heigold
AU  - P.C. Reed
PY  - 1994
DO  - 10.1007/bf00771791
UR  - https://pubs.usgs.gov/publication/70017045
ID  - 70017045
ER  -