TY  - BOOK
AU  - Helgesen,John O.
AU  - Leonard,Robert B.
AU  - Wolf,R.J.
ED  - United States
TI  - Hydrology of the Great Plains aquifer system in Nebraska, Colorado, Kansas, and adjacent areas
T2  - Regional aquifer-system analysis : Central MidwestChapter E
U1  - 551.490978 20th ed.
PY  - 1993///.
CY  - Washington: 
PB  - United States Government Printing Office, 
KW  - High Plains Aquifer
N1  - Includes bibliographical references (p. E77-E80)
ER  -