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Publisher
- john a. volpe national transportation systems center (u.s.)17
- united states. department of transportation. federal aviation administration10
- united states. national park service9
- institute of noise control engineering (ince)6
- acoustical society of america (asa)4
- american institute of aeronautics and astronautics (aiaa)4
- american chemical society3
- institute of noise control engineering of the usa3
- nasa center for aerospace information (casi)3