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A survey map of a Southeastern portion of Detour Township in Chippewa County, Michigan, measured between 1840 and 1977.

A survey map of a Southeastern portion of Detour Township in Chippewa County, Michigan, measured in 1977.

A survey map of a Southeastern portion of Detour Township in Chippewa County, Michigan, measured in 1840 and 1845.

A survey map of a Southeastern portion of Detour Township in Chippewa County, Michigan, measured in 1840 and 1845.

Notes from the external lines survey covering boundaries in Chippewa and Mackinac Counties, Michigan (see below for specific townships). These notes were compiled by Austin Burt for William A. Burt in 1840.

Notes from the external lines survey covering boundaries in Chippewa and Mackinac Counties, Michigan (see below for specific townships). These notes were compiled by Austin Burt for William A. Burt in 1840.

Notes from the external lines survey covering boundaries in Chippewa and Mackinac Counties, Michigan (see below for specific townships). These notes were compiled by Austin Burt for William A. Burt in 1840.

Notes from the external lines survey covering boundaries in Chippewa and Mackinac Counties, Michigan (see below for specific townships). These notes were compiled by Austin Burt for William A. Burt in 1840.

Notes from the external lines survey covering boundaries in Chippewa and Mackinac Counties, Michigan (see below for specific townships). These notes were compiled by Austin Burt for William A. Burt in 1840.

Notes from the external lines survey covering boundaries in Chippewa and Mackinac Counties, Michigan (see below for specific townships). These notes were compiled by Austin Burt for William A. Burt in 1840.

Notes from the external lines survey covering boundaries in Chippewa and Mackinac Counties, Michigan (see below for specific townships). These notes were compiled by Austin Burt for William A. Burt in 1840.

Notes from the external lines survey covering boundaries in Chippewa and Mackinac Counties, Michigan (see below for specific townships). These notes were compiled by Austin Burt for William A. Burt in 1840.

Notes from the external lines survey covering boundaries in Chippewa and Mackinac Counties, Michigan (see below for specific townships). These notes were compiled by Austin Burt for William A. Burt in 1840.

Notes from the external lines survey covering boundaries in Chippewa and Mackinac Counties, Michigan (see below for specific townships). These notes were compiled by Austin Burt for William A. Burt in 1840.

Notes from the external lines survey covering boundaries in Chippewa and Mackinac Counties, Michigan (see below for specific townships). These notes were compiled by Austin Burt for William A. Burt in 1840.

Notes from the external lines survey covering boundaries in Chippewa and Mackinac Counties, Michigan (see below for specific townships). These notes were compiled by Austin Burt for William A. Burt in 1840.

Notes from the external lines survey covering boundaries in Chippewa and Mackinac Counties, Michigan (see below for specific townships). These notes were compiled by Austin Burt for William A. Burt in 1840.

Notes from the external lines survey covering boundaries in Chippewa and Mackinac Counties, Michigan (see below for specific townships). These notes were compiled by Austin Burt for William A. Burt in 1840.

Notes from the external lines survey covering boundaries in Chippewa and Mackinac Counties, Michigan (see below for specific townships). These notes were compiled by Austin Burt for William A. Burt in 1840.

Notes from the external lines survey covering boundaries in Chippewa and Mackinac Counties, Michigan (see below for specific townships). These notes were compiled by Austin Burt for William A. Burt in 1840.

Notes from the external lines survey covering boundaries in Chippewa and Mackinac Counties, Michigan (see below for specific townships). These notes were compiled by Austin Burt for William A. Burt in 1840.