Martin W.Lehman has written Roots & Branches, A Narrative History of the Amish and Mennonites in Southeast United States, 1892,-1992. You may purchase Vol. 1, Roots 1982-1969, here.
You can purchase Volume 2 Branches – 1970-1992 at this page.
Martin Lehman has also written the forward to an important new 2011 book by biblical scholar C. Norman Kraus: “On Being Human,” Sexual Orientation and the Image of God.