アクロン (飛行船)
1 2 James L. Ballou / SAR Staff (Mar 2010 / September 6, 2022). “THE UNITED STATES’ NAVAL USE OF BARS IN BLIMPS”. SMALL ARMS REVIEW, V13N6 (Mar 2010), / SMALL ARMS REVIEW.com. 3, 24, 2023閲覧。