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Water resources data for Montana, water year 1972; part 2, water quality records
Water Resources Division, U.S. Geological Survey
1973, Water Data Report MT-72-2
Water resources data for the 1972 water year for Montana include records of data for the chemical and physical characteristics of surface water. Data on the quality of surface water (chemical, temperature, and sediment) were collected from designated sampling sites at predetermined intervals such as once daily, weekly, monthly or...
Atlas of Mars, Mare Acidalium quadrangle, MC-4
United States Geological Survey
1973, Open-File Report 73-328
This mosaic is made with computer enhanced Mariner 9 pictures, rectified and scaled to a Lambert conformal projection. Computer processing was performed by the Image Processing Laboratory (IPL) of the Jet Propulsion Laboratory (JPL). Processing included contrast enhancement and high-pass filtering which accentuates topographic features while subduing albedo variations. Photographic...