United States. War Department. Division of Military Aeronautics. Balloon observation, and instructions on the subject of work in the basket.
Chicago-čujuhus (17. p.)United States. War Department. Division of Military Aeronautics. Balloon Observation, and Instructions on the Subject of Work in the Basket.
MLA-čujuhus (9. p.)United States. War Department. Division of Military Aeronautics. Balloon Observation, and Instructions on the Subject of Work in the Basket.
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