TY  - RPRT
TI  - Educational materials from the U.S. Geological Survey
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 2001
DO  - 10.3133/fs04401_2001
UR  - https://pubs.usgs.gov/publication/fs04401_2001
ID  - fs04401_2001
ER  -