Originally published in 1976, "The Encyclopedia of German-American Genealogical Research" is still the best book available on German-American genealogy. The emphasis of the work is on German genealogical research in America, with special focus on immigration records, German ethnic religious bodies in America, and manuscript and published source materials, both in America and Germany. One of the most important parts of the book is the section on the "Locations of German-Speaking Congregations in the United States, 1906," based on a federal religious census of the time. This census gives considerable data on a number of the larger German-speaking denominations, enabling the genealogical researcher to establish the county in which German congregations were located.