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OH Title Author (Publisher) Price Location
1 Alaska 1:500K USGS 2 PIECES USGS 25.00 LL3
3 Colorado USGS 500K GEOLOGIC 52x43 USGS 25.00 K4
2 Colorado USGS 500K topo 52X43 USGS 25.00 K1
5 New Mexico USGS 500K topo whole state New Mexico 25.00 K2