(USGS) GEOLOGIC ATLAS OF THE UNITED STATES: Castle Rock Folio, # 198, Colorado; Department of the Interior; United States Geological Survey by G.B. Richardson; George Otis Smith, Director - 1915

Washington, DC: Department of the Interior, 1915. First Edition. Original Wraps. Good. Elephant folio 18 1/2" x 21 3/4", 13 pages of text, 3 color maps, one page black and white columnar section and two pages of photographs, in stiff printed wraps. A good copy, binding solid, map paper cream white and essentially clean, but the folio has been water damaged with the top 2" of the margins stained (not affecting printed area), and one map is torn 2" from edge with no damage to printed area. The exterior wraps are moderately yellowed and lightly soiled, with the previous owner name at top edge of front cover. Sold as is. Maps include topography, areal geology, structure sections, economic geology.