Landis, Ira D, Hans Groffs Aplenty, in Mennonite Research Journal, vol 14 no 3, July 1973. Continued in Oct 73, Jan 74, Apr 74. NYPL ISD (Lancaster Co) 75-1114. Available (for purchase) at https://www.lmhs.org/research/lmhs-publications/research-journal/. Information from this source tagged as [Ref: Landis HansGroffs 7[34][01][0-9]p[0-9]*].
Sources for birth and parent Information
parents:
Andrew GROFF & Magdalena ___ [Ref: Landis HansGroffs 7307p28]