61. Nebraska, Kansas, and Oklahoma aeromagnetic and gravity maps and data, a web site for distribution of data Author/Creator: Sweeney, Ronald E. Publication/Creation: [Reston, Va.?] : U.S. Geological Survey, [2005] Resource Type: Map Edition: Version 1.0. Access & Availability: Loading
62. Digital data to support development of a pesticide management plan for the Standing Rock Indian Reservation, Sioux County, North Dakota, and Corson County, South Dakota Author/Creator: Schaap, Bryan D. Publication/Creation: [Reston, Va.] : U.S. Geological Survey, 2004 Resource Type: Map Access & Availability: Loading