I've been putting together a database of every possible Schleis or Schleiss I can find living in the U.S. before 1930. I've got several hundred already. I'm in the midst of getting them typed into a state-by-state database at http://home.infionline.net/~pschleis/id64.htmlhttp://home.infionline.net/~pschleis/id64.html -- they should all be up there by the end of July 2004.
There might be something of use to you there. Best of luck!