TY  - RPRT
TI  - Hydrology of the Great Plains aquifer system in Nebraska, Colorado, Kansas, and adjacent areas
AU  - J. O. Helgesen
AU  - R. B. Leonard
AU  - R. J. Wolf
PY  - 1993
DO  - 10.3133/pp1414e
UR  - https://pubs.usgs.gov/publication/pp1414E
ID  - pp1414E
ER  -