[Notebook containing training notes from G. H. Frohn's service with 32nd Aero Squadron, circa 1917-1918]

Notebook containing training notes from G. H. Frohn's service with the 32nd Aero Squadron during World War I, circa 1917-1918. Topics include magnetism, electricity, regimental communications methods such as signal lamps, French and American phone systems, and other technologies. The notes are interspersed with line drawings of various communications and electrical systems.

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