USGS, 1969, Quality of Surface Waters of the United States, 1964 (Parts 5 and 6. Hudson Bay and Upper Mississippi River Basins, and Missouri River Basin), (WSP-1956) 462 pp., 6" x 9", The quality- of-water investigations of the United States Geological Survey are concerned with chemical and physical characteristics of the surface and ground water supplies of the Nation. Available on a first-come basis. May only be available as a B & W copy. Please allow for production time.