I already gave you the link to the online Minnesota census. Oluf and Jons Leaf show up on the 1905 census for Hayes township, Swift County, Minnesota. Hayes is the eastern edge in the center. I have Hillcrest and Monson Lake cemeteries in Hayes township on my Google Earth. Monson is the largest. There are a lot of Leaf showing up on census for Hayes township. Jons would have been 30 when Oluf was born so could be the father. I do not travel to the Swift County courthouse. It is just too expensive to drive there. You should post a query on the Swift board. A link to Minnesota - County is near to top of this page.