1:100,000-scale digital line graph (DLG) data  hydrography and transportation  US Geodata.  [computer file] 

 - Optional format. March 1991. 
 - Washington  Earth Science Information Center  1991. 
 - 1 computer laser optical disk  12 cm. 
<br/><br/> Disk Characteristics: CD-ROM 
<br/><br/><label>LCCN: </label>doc92000560  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hydrography--Databases.<br/>CD-ROM Fed. Doc.<br/>Transportation--Databases.