I want to thank Logan for this post. I accessed it (there is an option to use it in English) and searched for my family name Furstenberg (with an umlaut). Nothing under Fur, but when I looked under Fuer..., I found a card(front and back) that I believe is my family. It's difficult to read, but the names are correct. When I have more time, I'm going to have to see what I can figure out. So if you don't find your name under your first spelling attempt, don't give up!
BAUM (Gdansk); FREYSTADT (Berlin, Sweden); HEYMANN (Berlin, Israel, Geneva)
SCHULVALTER (Berlin, Brazil); SILBERSTEIN/SILVER (Gdansk, Chicago)