Chris; is it you are looking for on data, is it where they came from in Germany or other data ????
I found on www.anywho.com 6 Herzog's in Dubugue with names , address, & phone if you do not have.
Also if Emil had SSI you can as a family member go on the net and fill out a forum and request a copy of his original of this forum that every person had to fill outwhen SSI started. It Had will have his parents full surnames & where they lived.