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The sonic altimeter for aircraft
| Author: | Draper, C. S. |
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| Year: | 1937 |
| Document Type: | N/A |
| Series: | NACA Technical Notes |
| Report Number: | NACA-TN-611 |
| Link: | https://digital.library.unt.edu/ark:/67531/metadc54351/ |
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