Wilhelm und Caroline von Humboldt in ihren Briefen, Bd. Bd. 7, 1820-1835, Berlin: Mittler 1916 (7 Bände).

Digitalisat: http://www.archive.org/details/wilhelmundcaroli07humbuoft

Short title: Sydow 1916

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Zotero-ID: 68UB4XWG