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Some aspects of the helicopter noise problem
| Author: | Hubbard, Harvey H |
|---|---|
| Year: | 1954 |
| Document Type: | N/A |
| Series: | NACA Technical Notes |
| Report Number: | NACA-TN-3239 |
| Link: | https://digital.library.unt.edu/ark:/67531/metadc57099/ |
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