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communication × 63technology × 12
world-war-two × 9
military × 4
language × 4
united-states × 3
19th-century × 3
diplomacy × 3
modern × 3
war × 2
economy × 2
world-war-one × 2
france × 2
naval × 2
social-history × 2
american-civil-war × 2
britain × 2
spain × 2
government × 2
transportation × 2
age-of-sail × 2
early-modern × 2
media × 2
churchill × 2
cryptology × 2