East Reserve Historical Series volume launched Volume Five of the East Reserve Historical Series was launched at the Mennonite Heritage Village on Saturday, July 30th, 2011 at 2:00 pm. A History of the Chortitzer Mennonite Church of Manitoba, 1874-1914 by Dennis E. Stoesz is a study of the immigrants from the Bergthal Coloy who came from Russia to settle on the Mennonite East Reserve of Manitoba in the 1870s.