I am looking for info. on my great grandparents, Joseph and Agnes (Schoonhoven) Wallner. In the paper I have they owned 640 acres around Alzada and Agnes's mother may have been there to (Katie (Reintsma) Schoonhoven). I think this was about 1918-1928. I can not find them in the 1920 US census so I am hoping you can help me. I now that in the winter Joseph would mine in Lead, SD and in Butte, MT (1926-1928), but he farmed in the summer.