02140nam a2200433Ia 4500001000700000003000500007005001700012008004100029010002000070035002000090040001800110041000800128043001200136050001200148074001100160082001400171086001500185100003200200245020800232256003200440260012300472263000900595300006200604490006100666500002900727500002400756500003300780520034400813521006701157538021701224650004901441650002801490650004801518700002801566700003301594710003801627753002301665753001801688197195BIBL20200624062620.0930129s1993    vaun   f   m        N/A    a 93022546 //r94  a(OCoLC)27975806  aDLCcDLCdGPO0 geng  an-us---00aQC808.6  a0621-K00a557.32120 aI 19.121:91 aPhillips, Jeffrey D.2Local10aNational geophysical data gridsh[computer file]bgamma-ray, gravity, magnetic, and topographic data for the conterminous United Statescby Jeffrey D. Phillips, Joseph S. Duval, and Russell A. Ambroziak.  aComputer data and programs.  a[Reston, VA]bU.S. Dept. of the Interior, U.S. Geological SurveyaDenver, CObFor sale by USGS Map Distributionc1993.  a9306  a1 computer laser optical discbcol.c4 3/4 in.e1 manual. 0aU.S. Geological Survey digital data seriesvDDS-92Local  aTitle from title screen.  aNot copy-protected.  aDisk Characteristics: CD-ROM  aA 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.  aGeologists, scientists, public health officials, and teachers.  aSystem 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. 0aGeophysicszUnited StatesxDatabases.2Local 0aCD-ROM Fed. Doc.2Local 0aGeophysicszUnited StatesxSoftware.2Local10aDuval, Joseph S.2Local10aAmbroziak, Russell A.2Local 0aGeological Survey (U.S.)  2Local  aIBM PCcMS-DOS 5.0  aCD-ROM player