1. The difference between the potentiometric surfaces of the Aquia aquifer of September 1986 and September 1988 in southern Maryland Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Towson, Maryland : Department of the Interior, U.S. Geological Survey, 1990 Resource Type: Map Access & Availability: Loading
2. A digital simulation of the glacial-aquifer system in the northern three-fourths of Brown County, South Dakota Author/Creator: Emmons, Patrick J. (Patrick Jay), author Publication/Creation: Huron, South Dakota : U.S. Geological Survey, 1990 Resource Type: Book Access & Availability: Loading