USGS Map I-781-E Earthquake Hazard Map of the Henrys Lake Quadrangle, Idaho & Montana, 1972 by Irving J. Witkind. Scale 1:62,500. Map Indicates areas for Low, Moderate, Single Major, and Double Major Hazards in the event of an Earthquake. Map is used but is in very good condition. Map has writing on outer sleeve. See photos for details of condition. Thanks for Looking!