1:100,000-scale digital line graph (DLG) data hydrography and transportation US Geodata US Geodata One to one hundred thousand-scale digital line graph (DLG) data : Hydrography and transportation Digital line graph (DLG) data : hydrography and transportation text bibliography dcu Washington Earth Science Information Center 1991 Optional format. March 1991. monographic eng
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1 computer laser optical disk 12 cm. Disk Characteristics: CD-ROM Hydrography Databases CD-ROM Fed. Doc Transportation Databases doc92000560 920227 20160527184311.0 48655