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 information on potential problems with using high-resolution data."