X,21-X,40

https://web.archive.org/web/20151224091133/http://www.goethe-museum-kippenberg-stiftung.de/register/de/dept_51.html

VII,41-VII,61

https://web.archive.org/web/20160402091206/http://www.goethe-museum-kippenberg-stiftung.de/register/de/dept_47.html

Frosch - Zeno.org

http://www.zeno.org/Wander-1867/A/Frosch

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