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  - 2000
DO  - 10.3133/fs04400
UR  - https://pubs.usgs.gov/publication/fs04400
ID  - fs04400
ER  -