These digitized aeromagnetic datasets from the US Geological Survey show variations in the Earth's magnetic field caused mostly by the distribution of minerals that make up the upper part of the earth's crust. The data may be accessed by clicking on the name of a state or territory. Users can download data for an entire state or obtain files by clicking on state maps showing location plots.

In this US Geological Survey open file report, "High Resolution, Low Altitude Aeromagnetic and Electromagnetic Survey of Mt. Rainier," V.L. Rystrom, Carol A. Finn, and Maryla Descsz-Pan present "new aeromagnetic and electromagnetic data, compare results from previously obtained, low-resolution aeromagnetic data with new data collected at a low-altitude and closely spaced lightlines, and provide...

Those interested in aerial photographs, satellite images, or maps as ways to conceptualize the world, will find this site interesting, entertaining, and educational. The US Dept. of Interior offers a National Atlas of the United States, an interactive resource that allows users to view part or all of the US and overlay layers of information including natural features, political boundaries, federal...