Whatever happens, we have got, the Maxim, and they have not': The Conspicuous Absence of Machine Guns in British Imperialist Imagery,” by Ramey Mize – Rutgers Art Review
Gatling gun - Wikipedia
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Editorial Special : The Gatling Gun – Small Arms Defense Journal
HyperWar: The Machine Gun (Vol. I/Part II)
Powered guns - Heavy Machine Guns - Bev Fitchett's Guns