The Decker Books
Klaus Peter Decker has written a number of books about the history of Büdingen and the Isenburg region. Of primary interest to Volga German genealogy researchers are the two books about the emigration of individuals and families from the Büdingen area in 1766:
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Büdingen als Sammelplatz der Auswanderung an die Wolga 1766 (published in 2009); and