Geothermal data compiled by the Division of Geology and Earth Resources, Washington Department of Natural Resources ; map produced by the National Geophysical and Solar-Terrestrial Data Center, National Oceanic and Atmospheric Administration ; for the Division of Geothermal Energy, United States Department of Energy.
Scale 1:500,000. 1 cm. to 5 km. 1 in. to ca. 8 miles ; Lambert conformal conic proj. based on standard parallels of 33⁰ and 45⁰ (W 124⁰45ʹ--W 117⁰00ʹ/N 49⁰00ʹ--N 45⁰30ʹ).
Relief shown by spot heights and contour interval of 500 ft. Includes table of "Thermal and mineral springs," "Physiographic provinces of Washington, " "Spring and well location system, " text and references.