2025
Profiles of East Frisian (German) Pioneers who Settled the Prairie in Turner County, South Dakota, Derek M. Heeren
2024
Remembering East Frisian Immigrants Who Settled near German Valley, Illinois: A Family History Scrapbook, Derek M. Heeren
2023
Ethnic Heritage of the Families from East Friesland (Northwest Germany) who Migrated to the American Midwest, Derek M. Heeren
2015
United States Census Summary Chart, RootsWeb