TY  - RPRT
TI  - Karst mapping in the United States: Past, present and future
AU  - David J. Weary
AU  - Daniel H. Doctor
PY  - 2015
DO  - 10.1130/2015.2516(04)
UR  - https://pubs.usgs.gov/publication/70159678
ID  - 70159678
ER  -