Source:Thiessen, Hermann. Hermann Thiessen Fonds

A compilation of approximately 10,000 cards containing data about Mennonites from West Prussia, compiled by genealogist Hermann Thiessen (29 May 1919 - 19 Oct 2011).

"The data was taken at least in part from Werner Zimmerman’s card collection which was compiled by Werner Zimmermann in the 1930’s to 1950’s and contains data about W. Prussian Mennonites on about 8000 cards."- Tim Janzen on MENNO-ROOTS-L-Archives 17 Dec 2001