The collection contains personal materials from all three creators, including school transcripts and diplomas, school papers, baptismal certificates and other documentation of their early family life. However, the most extensive personal materials are the writings of Helen and Amelia and the correspondence of Amelia and her family.
The other major category of materials in the collection is family history. This includes several generations of correspondence of Amelia’s family, especially of her many relatives in Germany who wrote to Amelia’s mother Elizabeth Ellenberger, her Aunt Selma Ellenberger, and to Amelia herself, covering a period of over a century. The family history materials, in addition to these primary source documents, includes extensive genealogical research materials. Published genealogies, primarily collected by Adam, relate to many branches of his ancestors, especially on his maternal, Becker, side. He and Amelia both compiled numerous family charts and histories.