William Joseph Hammer (Esperanto Wikipedia)

Analysis of information sources in references of the Wikipedia article "William Joseph Hammer" in Esperanto language version.

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nytimes.com

"Maj. Hammer Dies. An Edison Pioneer. Won Distinction as Engineer, Scientist and General Staff Officer in War". New York Times. 25a de marto, 1934. Alirita la 28an de aŭgusto 2019. "Major William J. Hammer, USA, retired, engineer, scientist and World War ... He was president of the Edison Pioneers in 1908 ..."