National airspace system plan.
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| Title: | National airspace system plan. |
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| Authors: | Helms, J. L., Poritzky, S. B. |
| Source: | Astronautics & Aeronautics; June 1982, Vol. 20, p50-61, 12p |
| Database: | Applied Science & Technology Source |
| ISSN: | 00046213 |
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