I found this and it does not answer your question but may help with Zerbe research.

Christ Lutheran Cemetery
(Stone Church)

Located on the grounds of the Allenwood Federal Prison Camp (Behind White Deer Golf Course).
Zerbe, Dora C. b. Aug 19 1864 d. Dec 10 1880
Zerbe, Peter M. b. Sep 16 1865 d. Mar 22 1882
Zerbe, Susan A. b. June 21 1867 d. Dec 19 1880

Jeff