There is a self-published book from 1972 that I have heard rumors of called “Krabbenhoft and Kin” by Elsa Krabbenhoft Radichel. I understand that there is a copy in the library of the Minnesota History Museum, and that there may also be Xerox copies of the book.
If anyone has a PDF copy or would be willing to share their hard copy so I can make a PDF, please drop me a line.