TY - RPRT TI - Digital map of water-level changes in the High Plains Aquifer in parts of Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming, 1980 to 1996 AU - Brian C. Fischer AU - Virginia L. McGuire PY - 1999 DO - 10.3133/ofr99198 UR - https://pubs.usgs.gov/publication/ofr99198 ID - ofr99198 ER -