Dear Board Members: 
Yesterday I provided a reference to the list of passengers on the Thistle of Glasgow (www.palproject.org/pa/1730thilse.htm) It referenced a book Auswanderer aus der Unbebungvon Ludwigshafen a. Rh dem Schiff "Thistle of Glawgow" 1730. 
Unbelievably, the St. Louis County Library has this little 22 page volume. It is in German but seems to contain some biographical information about some of the passengers on the Thistle. Unfortunately the only reference to our family is: 
SPERGER Wolfer 
There is also some introductory information. If anyone wants to read this and perhaps provide a summary in English, I would be happy to send a copy since I did make a copy of the entire booklet. 
I went back to the website and found the real reference I should have checked: 
18th Century Emigrants From Northern Alsace to America by Annette K. Burgert, 1992. I checked this reference and found reference to Johannes Wolfersberger from Mattstall, which appartently is now Lembach in France. Comment is made that only surname is mentioned on the ship's list. There is reference to his wife Anna Margaretha and 1 son Johann Peter. No mention of Jacob Friedrich. 
This book then referenced a book Pennsylvania German Pioneers. Here I found the ship's lists. For most ships there are 3: The Capitan's List, the Oath of Allegiance List and the Oath of Abjuration. I found on List A, 
Wolfer Sperger 
and on list B 
Wolfer A Sperger. 
This book (actually 3 volumes) had a copy of List B for the Thistle so you can actually see the written Wolfer A Sperger. 
I have no idea how we got to the list that has Johann Wolfersberger, Anna Margearetha, Johann Peter and Jacob Friedrich from a signature that has only Wolfer A Sperger. There is obviously more data somewhere; maybe some of you know what this is. 
But, at least I was able to find a copy of the Thistle of Glasgow ship list with the signature of Johann. If anyone wants copies of any of this let me know. 
I will be out of town for the next several days so if you don't get a quick response that is why. 
David Wolfersberger