- Source: a paper in the belongings of Alice Lina Gerdeman. Elisabeth Lehmann, living in Westerkappeln Germany, wrote these names and sent them to Elmer Gerdeman in 1952, she got the records from the Bürgermeisteramt (mayor's office).
- Source2: a paper found in Marilyn Rosburg's Cedar Chest (2021) author unknown
- Gerhard Heinrich came to American 23 Sep 1851, Friedrich came to America date unknown
- Outline Descendant Tree 5 generations 9 generations