This map shows the boundaries of Indian Treaties and land cessions that occurred within Otter Tail County (outlined in red). It is a piece of the map of Minnesota at the USGenWeb map archives
These maps are from the 1899 paper, Indian Land Cessions in the United States. It was complied by Charles C. Royce. The paper appeared in the 18th Annual Report of the Bureau of American Ethnology, to the Secretary of the Smithsonian Institution, 1896-97, by J. W. Powell, Director - In Two Parts - Part 2. Printed in Washington, by the Government Printing Office, 1899.
Link to the Library of Congress Indian Treaty web site
268 - Ojibwa cession of 1847. Land was ceded to create
a reservation for the Winnebago from Wisconsin. Winnebago later
ceded this land in 1855 when they were moved to southern Minnesota.
269 - Ojibwa cession of 1847. Land was ceded to create a reservation for the Menominee from Wisconsin. They never moved there and the land was permanently ceded in 1855.
289 - Dakota cession of 1851.
357 - Ojibwa cession of 1855..