I personally don't know a whole lot about these societies other than reading about them in the past for some local research. Davenport, Iowa, also had a large and active German population. The German American Heritage Center, call (563) 322-8844, might have some information that would be helpful for you. I've always had great response contacting the Missouri History Library & Research Center in the past. Their archivists have been quick to respond to my email requests. I got copies of original documents relating to the American Fur Company from them promptly and with minimal fees.