Ruhl, J. F. (1995). Relation of fracture orientation to linear terrain features, anisotropic transmissivity, and seepage to streams in the karst Prairie du Chien group, southeastern Minnesota. U.S. Geological Survey.
Chicago Style (17th ed.) CitationRuhl, J. F. Relation of Fracture Orientation to Linear Terrain Features, Anisotropic Transmissivity, and Seepage to Streams in the Karst Prairie Du Chien Group, Southeastern Minnesota. Mounds View, Minnesota: U.S. Geological Survey, 1995.
MLA (9th ed.) CitationRuhl, J. F. Relation of Fracture Orientation to Linear Terrain Features, Anisotropic Transmissivity, and Seepage to Streams in the Karst Prairie Du Chien Group, Southeastern Minnesota. U.S. Geological Survey, 1995.
Warning: These citations may not always be 100% accurate.