Ludwig Hardt (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Ludwig Hardt" in English language version.

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bruckfamilyblog.com

  • Brook, Richard von. "POST 28: EMMY GOTZMANN, GERMAN POST-IMPRESSIONIST PAINTER". www.bruckfamilyblog.com. Retrieved 1 September 2018.

vdbk1867.de