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Best rectangular and I-shaped cross sections for airplane wing spars
| Author: | Sonntag, R |
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| Year: | 1922 |
| Document Type: | N/A |
| Series: | NACA Technical Memorandums |
| Report Number: | NACA-TM-148 |
| Link: | https://digital.library.unt.edu/ark:/67531/metadc55796/ |
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