National geochronological and natural radioelement data bases  [computer file] 
 National geochronological data base  Natural radioelement data base 
U.S. Department of the Interior, U.S. Geological Survey. 
, Computer data and program. 
 - [Reston, Va.?]  [Denver, Colo.  The Survey  For sale by USGS Distribution Branch]  1995. 
 - 1 computer laser optical disc  col.  4 3/4 in. 
 - U.S. Geological Survey digital data series  DDS-14 .
<br/><br/> Title from container insert.  Shipping list no.: 95-006-E.  Disk Characteristics: CD-ROM 
<br/><br/>A. National geochronological data base / by Robert E. Zartman, Charles A. Bush, and Carl Abston -- B. Natural radioelement data base / by Charles A. Bush and Carl Abston. 
<br/><br/> The NGDB contains more than 30,000 individual published ages of rocks and minerals in the United States; while the NRDB contains analyses of the natural radioelements from more than 8500 whole rocks. 
<br/><br/><br/>System requirements: IBM or compatible personal computer; 640 kb RAM; MS or PC-DOS version 5.0 or later; SVGA graphics card (640x480); SGVA color monitor; Microsoft MSCDEX version 2.1 or later; CD-ROM drive with ISO 9660 software driver; hard disk drive. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geological time--Databases.<br/>CD-ROM Fed. Doc.<br/>Radioactive substances--Databases.
<br/><br/><label>GPO Item No.: </label>0621-K 
<br/><br/><label>Gov. Doc. Class. No.: </label>I 19.121:14