1. Database of the geologic map of North America, adopted from the map by J.C. Reed, Jr. and others (2005) Author/Creator: Garrity, Christopher P. Publication/Creation: Reston, Va. : U.S. Dept. of the Interior, U.S. Geological Survey, 2009 Resource Type: Map Edition: Version 1.0. Access & Availability: Loading
2. David Rumsey historical map collection Author/Creator: Cartography Associates Publication/Creation: [Place of publication not identified] : Cartography Associates, 2003- Resource Type: Map Access & Availability: Loading
3. Digital aeromagnetic datasets for the conterminous United States and Hawaii : a companion to the North American magnetic anomaly map Author/Creator: Geological Survey (U.S.) Publication/Creation: [Reston, Va.] : U.S. Geological Survey, 2003 Resource Type: Map Access & Availability: Loading
4. Digital data grids for the Magnetic anomaly map of North America Author/Creator: North American Magnetic Anomaly Group Publication/Creation: [Reston, Va.] : U.S. Dept. of the Interior, U.S. Geological Survey, 2003 Resource Type: Map Edition: Version 1.0. Access & Availability: Loading