Bagstad/Anderson

I am looking for information on my great-grandfather Andrew A. Bagstad. Here is what I know. He was born 19 Jun 1847 in Hedemarken and died 18 Feb 1935 in Lyle, Mower Co., MN. He was born Anderson ( son of Anders A. Bagstad b. 1808 in Norway d. 1896 in Mower Co., MN and Anna A. Bagstad b. 1820 in Norway d. 1909 in Mower Co.,MN) { information taken off of tombstone}, came to America as an Anderson and changed his name to Bagstad to be the same as his siblings and show his relationship to them as a family member. Stories from my father state the Andrew as a young man worked for a farmer and had to take the cattle up in the mountains at springtime for grazing and remained there till fall when he would return to the farm. He was given some clothes and food when he left but primarily had to live off the land and was allowed some milk from a fresh cow as long as he did not deprive the calf. The 1920 Federal Census states he left Norway for America in 1870. His wife Anna A. Anderson came to America in 1861. She was b. 07 Nov 1855 in Sagn, Norway d. 07 Jul 1925 Mower, Co., MN. I have asked Jan Wiborg to attach a photo of a trunk I sent him which has been in the Bagstad family. I am attempting to link it to the family and see where this trunk leads me. Any information I can get will truly be appreciated. Gene