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Hubbard, Gerard (June 1943). "Aircraft Insignia, Spirit of Youth". Vol. LXXXIII (No. 6) National Geographic, pp. 710-722 modified with Microsoft Paint
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50th
Observation Squadron emblem. Approved 15 February 1924
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50 Observation Sq (later 431st
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50_Observation_Sq_(later_431st_Bombardment_Sq)_emblem.png
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