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References
- ↑ American Aviation, Volume 29. Ziff-Davis Publishing. 1965.
{{cite journal}}: Missing or empty|title=(help) - ↑ Air Progress: 51. November 1971.
{{cite journal}}: Missing or empty|title=(help) - ↑ Sport Aviation. 30. 1981.
{{cite journal}}: Missing or empty|title=(help) - ↑ Flight International: 169. 1 February 1973.
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