TY  - RPRT
TI  - Comparison of a new GIS-based technique and a manual method for determining sinkhole density: An example from Illinois' sinkhole plain
AU  - J.C. Angel
AU  - D.O. Nelson
AU  - S.V. Panno
PY  - 2004
UR  - https://pubs.usgs.gov/publication/70027260
ID  - 70027260
ER  -