TY  - RPRT
TI  - An evaluation of several geophysical methods for characterizing sand and gravel deposits
AU  - K.J. Ellefsen
AU  - J.E. Lucius
AU  - D.V. Fitterman
PY  - 1998
DO  - 10.3133/ofr98221
UR  - https://pubs.usgs.gov/publication/ofr98221
ID  - ofr98221
ER  -