God to find you. I am Terril Mills and two of the names on your list are relatives, Tom Mills worked for Milo Burke in 1892 in Ten Sleep. Ben Denny is also a relative. Any of the letters referring to them would be great.
tensleepcemetery.com is our local cemetery. We have tried to post obituaries there.
Go to http://newspapers.wyo.gov/
and you can search all about the Wigwam. It is now a State fish hatchery. The newspapers are before 1922 for the most part.