| 11. | Ickes would not back down, fearing military use of the dirigibles.
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| 12. | Izzy stays with the dirigible in hopes to repair it.
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| 13. | Count von Zeppelin later designed the dirigible aircraft that bore his name.
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| 14. | He also developed and constructed a large gasoline engine for his dirigible.
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| 15. | The dirigibles are invisible to almost all forms of tracking.
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| 16. | Ritchel imagined a transcontinental airline with larger dirigibles cranked by 11 men.
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| 17. | After World War I, the base was adapted to accommodate dirigibles.
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| 18. | Organizers invited pilots of monoplanes, biplanes, balloons, and dirigibles.
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| 19. | The Army did not purchase another dirigible until after World War I.
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| 20. | On this land the Navy erected a dirigible mooring mast.
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