Рудольф Гундлах (Ukrainian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Рудольф Гундлах" in Ukrainian language version.

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books.google.com

Official Gazette of the United States Patent Office. 494. U.S. Patent Office. 1938: 371.

worldcat.org

Czarnecki, Jacek (2019). The Rebirth and Progress of the Polish Military During the Interwar Years. Journal of Military History. Society for Military History. 83 (3): 747. OCLC 473101577.