02253nam a2200457Ia 4500 197195 BIBL 20200624062620.0 930129s1993 vaun f m N/A 93022546 //r94 (OCoLC)27975806 DLC DLC GPO eng n-us--- PUXA QC808.6 0621-K 557.3 12 I 19.121:9 Phillips, Jeffrey D. Local 150592 National geophysical data grids [computer file] gamma-ray, gravity, magnetic, and topographic data for the conterminous United States by Jeffrey D. Phillips, Joseph S. Duval, and Russell A. Ambroziak. Computer data and programs. [Reston, VA] U.S. Dept. of the Interior, U.S. Geological Survey Denver, CO For sale by USGS Map Distribution 1993. 9306 1 computer laser optical disc col. 4 3/4 in. 1 manual. U.S. Geological Survey digital data series DDS-9 Local 182290 Title from title screen. Not copy-protected. Disk Characteristics: CD-ROM A package including gridded gamma-ray, gravity, magnetic, and topographic data for the conterminous United States with display software that allows the user to view data in image format and to overlay geology and state and county boundaries and U.S. Geological Survey software for analyzing and processing potential-field geophysical data. Geologists, scientists, public health officials, and teachers. System requirements: IBM or compatible PC; 640K RAM; MS-DOS or PC-DOS 5.0 or later; Microsoft MSCDEX 2.1 or later; CD-ROM drive with ISO 9660 software driver; hard disk drive; SuperVGA graphics; math coprocessor. Geophysics United States Databases. Local 101990 CD-ROM Fed. Doc. Local 71074 Geophysics United States Software. Local 101990 Duval, Joseph S. Local 89492 Ambroziak, Russell A. Local 51917 Geological Survey (U.S.) Local 227708 IBM PC MS-DOS 5.0 CD-ROM player 149158 149158 0 0 0 CD_FED 0 ref 186214 10 10 9 2016-05-27 288539 0 CD-FED 80000001825721 2016-05-27 00:00:00 r:197195 z:NCC:X 9