SAGA OMII databases
I highly recommend http://www.omii.org/http://www.omii.org/for anyone searching Berkey or other Anabaptist families.
Many databases to look at.My personal favorite is the Lint database which has the Berkey Book (Ruth Berkey Reichley) included but you can find lots of Berkeys and Burkeys in the other databases (Kidron, Hostetter) as well.