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https://www.usgs.gov/data/digital-database-a-3d-geological-model-western-south-dakota Digital database of a 3D Geological Model of western South Dakota | U.S. Geological Survey This digital GIS dataset and accompanying nonspatial files synthesize the model outputs from a regional-scale volumetric 3-D geologic model that portrays the... western south dakota https://www.usgs.gov/media/slideshows/2012-western-south-dakota-hydrology-conference-10th-annual-photos 2012 Western South Dakota Hydrology Conference (10th Annual) Photos | U.S. Geological Survey western south dakota https://www.usgs.gov/media/images/2008-western-south-dakota-hydrology-conference 2008 Western South Dakota Hydrology Conference | U.S. Geological Survey Mark Anderson, Director of the USGS South Dakota Water Science Center, with Dr. John H. Marburger, III, Director, Office of Science and Technology Policy,... western south dakota 2008 hydrology conference geological