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Publisher
- Federal Aviation Administration574
- Federal Highway Administration416
- Coast Guard356
- National Highway Traffic Safety Administration334
- National Transportation Safety Board327
- Systems Research and Development Service314
- National Highway Safety Bureau169
- Air Traffic Service163
- Aviation Medicine Office141
- Safety Office101
- Motor Carrier Safety Bureau92
- Flight Standards Service59
- Railroad Safety Bureau47
- Federal Railroad Administration40
- Public Roads Bureau34
- Airports Service12
- Urban Mass Transportation Administration12
- St. Lawrence Seaway Development Corporation8
- Aircraft Development Service7
- Saint Lawrence Seaway Development Corporation2