1:2,000,000-scale digital line graph (DLG) data.  US Geodata.  [computer file] 
 Digital line graph (DLG) data  One-to-two-million-scale digital ine graph (DLG) data 
U.S. Geological Survey, Earth Science Information Center 
 - Reston, VA  The Center  [1995] 
 - 1 computer laser optical disk  col.  4 3/4 in. 
<br/><br/> Title from disk label.  "US GeoData"--Disk label.  Digital line graph data covers 21 areas in the United States, Alaska, and the Aleutian and Hawaiian Islands.  Disk Characteristics: CD-ROM 
<br/><br/><br/>System requirements: IBM PC-XT or compatible computer, MS-DOS 3.1 or later, 640KB memory, EGA monitor and display card, CD-ROM reader using the Microsoft Extensions, Version 2.0 or later. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hydrology--Databases.--United States<br/>CD-ROM Fed. Doc.<br/>Transportation--Databases.--United States
<br/><br/><label>Subjects--Geographic Terms: </label><br/>United States--Maps, Topographic--Databases.