34 01 00
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Operation and Maintenance of Transportation
Includes maintenance, repair, rehabilitation, replacement, restoration, preservation, etc. of transportation.

34 01 00 Operation and Maintenance of Transportation
34 01 13 Operation and Maintenance of Roadways
34 01 23 Operation and Maintenance of Railways
34 01 33 Operation and Maintenance of Airfields
34 01 43 Operation and Maintenance of Bridges