TY  - RPRT
TI  - New information resources of the U.S. Geological Survey Library System, Number 57, January 1991
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1991
DO  - 10.3133/ofr91400a
UR  - https://pubs.usgs.gov/publication/ofr91400A
ID  - ofr91400A
ER  -