The bulk of this collection consists of correspondence, and it is one of the largest, if not the largest, collections of family correspondence in the MLA (18 cubic feet of letters, perhaps over 20,000 total). The parents and brothers and sisters of Jacob and Louise corresponded with them for seven decades, beginning with their move to California in 1921 and ending with Jacob’s death in 1986. While not all of their fourteen brothers and sisters were equally regular in writing their siblings, for many decades weekly or at least bi-weekly letters were sent to Washington, DC. By the 1940s numerous nieces and nephews were corresponding as well, and many friends were in regular contact, including three boxes of correspondence related specifically to Jacob’s genealogical work. Unfortunately, except for the letters Jacob and Louise sent her parents, the other side of the correspondence is not preserved in this collection (P.U. wrote to his children for almost fifty years, 1921 to 1970). All of the letters from their parents and many earlier letters from siblings are in German.
The collection contains only a small amount of documentation of personal life, and has some materials related to their participation in the congregational church, a community association, a fledgling Washington Mennonite Fellowship, and other activities, but virtually no personal financial records, photos, travels, etc. A large library of Mennonite genealogies, Mennonite history, scientific, and religious volumes also was donated to the MLA. The genealogy and history books almost all duplicated books already in the MLA collection and duplicates were generally not retained.