Adolf Koch (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Adolf Koch" in English language version.

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adolf-koch.de

Krüll, Jürgen (October 2020). Freikörperkultur in Berlin, 50. Todestag von Adolf Koch [Free Body Culture in Berlin, 50th anniversary of Adolf Koch's death] (PDF) (in German). Hanover: DFK. p. 6. Retrieved 7 January 2022.

books.google.com

Williams 2007, p. 1. Williams, John Alexander (2007). Turning to Nature in Germany: Hiking, Nudism, and Conservation, 1900-1940. Stanford University Press. ISBN 978-0-8047-0015-3.
Toepfer, Karl Eric (1997). "Nacktkultur; Adolf Koch". Empire of Ecstasy: Nudity and Movement in German Body Culture, 1910–1935. Berkeley, Los Angeles, Oxford: University of California Press. pp. 35–36. ISBN 9780520918276.