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Sommario
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| Manufacturing industries, Metals, SUBSTITUTES. | |
| 8 | |
| United States Marine Corps | |
| 14 | |
| Aircraft carriers, Airships | |
| 17 | |
| Grand Coulee Dam (Wash.) |
| 28 | |
| Civil defense | |
| 33 | |
| Airplanes (Design), Jet propulsion | |
| 34 | |
| Photography, Sports |
Parole e frasi comuni
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