The East Sioux Classis Archives document the corporate institutional life of a regional classis of the Reformed Church in America based in northwest Iowa in the mid and late twentieth century. The records include the minutes of the classis and related material. Collectively, these archives provide evidence for the historical growth of a multi-generational Dutch-immigrant Protestant denomination in the trans-Mississippi prairies and northern plains over seventy-five years.
Anderson, Douglas Firth, "East Sioux Classis" (2015). Finding Aids. 11.