You have hit "pay dirt" in a really big way!
I know this clan very well. It is a little hard to know where to start! My mother's ancestors and the Edlunds came from adjacent parishes in Sweden and homesteaded in Clay County, Dakota Territory (South Dakota) next to each other. Many of us still live in southeast South Dakota.
Do you want the names and addresses of some of the members of the Edlund - Peterson Clan? Do you want a copy of the book History of the Swedes Who Settled in Clay County, South Dakota and Their Biographies (1947) which was compiled by August Peterson? The book is $19.00 plus handling and postage (airmail or surface). I have been distributing these books since the 1970's when August and Anna's daughter Florence did not want to handle them anymore.
You can visit the Dalesburg community in Clay County, South Dakota at: www.angelfire.com/sd/dalesburg99/
I look forward to your reply.
Dalesburg Scandinavian Association