TY - RPRT TI - Adaptation of a ground-water-flow model of the Little Androscoggin River Valley aquifer, Oxford County, Maine to a microcomputer AU - Thomas J. Mack PY - 1991 DO - 10.3133/ofr90371 UR - https://pubs.usgs.gov/publication/ofr90371 ID - ofr90371 ER -