Hi Judy,
Thank you for your very informative response. I am not sure he was here by 1850 (I haven't found him in the census for that year)and, if I remember correctly, I have looked at Nils Olsson's book. About twenty years ago I visted Swenson Research Center but didn't have any luck while there. Since research has changed so rapidly since then, with many more records available, it may be worthwhile contacting them again. I will also ckeck out the site you gave me and thanks for helping me search outside the box.
Daraleen