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& National Defense
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45 Military Technology
1
58 Geosciences
1
580000 -- Geosciences
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Airships
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And National Defense
1
Balloons
1
Design
1
Equipment
1
Flight Testing
1
Historical Aspects
1
Launching
Meteorology
Military Equipment
1
Performance
1
Pressure Effects
1
Surveillance
1
Temperature Effects
1
Testing 450000* -- Military Technology
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Uses
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Weaponry
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