Washington, DC: United States Geological Survey/USGS/Government Printing Office/GPO, 1957. Softcover. Item #43627
Pages 399 through 516 with map and bibliography, plus 50 indicator plants with illustrated example and plant photograph on facing page, including plant family, description and environment. Bound in original gray stiff paper with lettering in black. Slight fade to the perimeter of the covers. A fine copy.