Persons of the Surname Zimmerman in the County Atlas and County History Card File at the Ohio Historical Society, Columbus, Ohio
Zimmermans of Frederick & Washington Counties, Maryland
Henry Zimmerman Search
Memoirs of Roger Max Zimmerman Volume 2 Academic Life
Memoirs of Roger Max Zimmerman: Family
Memoirs of Roger Max Zimmerman: Academic life
Memoirs of Roger Max Zimmerman: Above ground activities
Memoirs of Roger Max Zimmerman Volume 1 Family
Memoirs of Roger Max Zimmerman: Volunteer activity
Zimmerman Families of Frederick and Washington County, Maryland
Persons of the Surname Zimmerman in the Various Card Files at the Ohio Genealogical Society Library in Mansfield, Ohio
Memoirs of Roger Max Zimmerman: Yucca Mountain Project
Memoirs of Roger Max Zimmerman Volume 3 Yucca Mountain Project
Some Zimmermans from Stark County, Ohio
Flowers and Fruits from the Wilderness, by Z.N. Morrell, 1873
Zimmermans of Allen County, Indiana
Memoirs of Roger Max Zimmerman Volume 5 Volunteer Activities
Index to "A History of Limestone County, Texas, 1833-1860," by Hampton Steele
Eatons of Illinois, Indiania [sic], Kentucky, North Carolina, Tennessee, Texas and Virginia
An Assessment of the Usage of an Agricultural Non-point Pollution Modes in Summit County, Ohio