‘Observation Balloon’ historical pictures (exact matches)

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Observation balloon ascending, World War I
Observation balloon ascending, World War I
Japanese observation balloon over Port Arthur, Russo-Japanese War, 1904
Japanese observation balloon over Port Arthur, Russo-Japanese War, 1904
A booby-trapped balloon filled with explosive gas ended the career of German First World War …
A booby-trapped balloon filled with explosive gas ended the career of German First World War …
Observation balloon, World War I
Observation balloon, World War I
The captive observation balloon in Montmartre
The captive observation balloon in Montmartre
Panoramic View of the Great Battle of the Spanish-American War, the General Assault on Santiago de Cuba on 1 July
Panoramic View of the Great Battle of the Spanish-American War, the General Assault on Santiago de Cuba on 1 July
Modern armaments, 1938: Modern Observation Balloon
Modern armaments, 1938: Modern Observation Balloon
Siege of Port Arthur, Russo-Japanese War
Siege of Port Arthur, Russo-Japanese War