Overall view of the German public Archives by Archivschule Marburg
Archives in North Rhine-Westphalia (with Survey of Holdings)
Staate Archives Hamburg: LinkToYourRoots 1890 - 1914
Die niedersächsischen Staatsarchive - Auswandererquellen (online - Database of Lower Saxon Emigration Data from the State Archives)
Emigrants from Württemberg/ More than 50.000 emigrant-names online available
Archiv der Auswanderer-Mission Hamburg. Auswandererbriefe (Emigrant letters from the Archive of the Auswanderer-Mission Hamburg)

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National Archives Washington (D.C.)