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A survey map of the southern section of Duncan Township in Houghton County, Michigan, measured between 1846 and 1851.

Notes from the external lines survey covering boundaries in Houghton and Iron Counties, Michigan (see below for specific townships). These notes were compiled by John Burt in 1846.

Notes from the external lines survey covering boundaries in Houghton and Iron Counties, Michigan (see below for specific townships). These notes were compiled by John Burt in 1846.

Notes from the external lines survey covering boundaries in Houghton and Iron Counties, Michigan (see below for specific townships). These notes were compiled by John Burt in 1846.

Notes from the external lines survey covering boundaries in Houghton and Iron Counties, Michigan (see below for specific townships). These notes were compiled by John Burt in 1846.

Notes from the external lines survey covering boundaries in Houghton and Iron Counties, Michigan (see below for specific townships). These notes were compiled by John Burt in 1846.

Notes from the external lines survey covering boundaries in Houghton and Iron Counties, Michigan (see below for specific townships). These notes were compiled by John Burt in 1846.

Notes from the external lines survey covering boundaries in Houghton and Iron Counties, Michigan (see below for specific townships). These notes were compiled by John Burt in 1846.

Notes from the external lines survey covering boundaries in Houghton and Iron Counties, Michigan (see below for specific townships). These notes were compiled by John Burt in 1846.

Notes from the external lines survey covering boundaries in Houghton and Iron Counties, Michigan (see below for specific townships). These notes were compiled by John Burt in 1846.

Notes from the external lines survey covering boundaries in Houghton and Iron Counties, Michigan (see below for specific townships). These notes were compiled by John Burt in 1846.

Notes from the external lines survey covering boundaries in Houghton and Iron Counties, Michigan (see below for specific townships). These notes were compiled by John Burt in 1846.

Notes from the external lines survey covering boundaries in Houghton and Iron Counties, Michigan (see below for specific townships). These notes were compiled by John Burt in 1846.

Notes from the external lines survey covering boundaries in Houghton and Iron Counties, Michigan (see below for specific townships). These notes were compiled by John Burt in 1846.

Notes from the external lines survey covering boundaries in Houghton and Iron Counties, Michigan (see below for specific townships). These notes were compiled by John Burt in 1846.

Notes from the external lines survey covering boundaries in Houghton and Iron Counties, Michigan (see below for specific townships). These notes were compiled by John Burt in 1846.

Notes from the external lines survey covering boundaries in Houghton and Iron Counties, Michigan (see below for specific townships). These notes were compiled by John Burt in 1846.

Notes from the external lines survey covering boundaries in Houghton and Iron Counties, Michigan (see below for specific townships). These notes were compiled by John Burt in 1846.

Notes from the external lines survey covering boundaries in Houghton and Iron Counties, Michigan (see below for specific townships). These notes were compiled by John Burt in 1846.

Notes from the external lines survey covering boundaries in Houghton and Iron Counties, Michigan (see below for specific townships). These notes were compiled by John Burt in 1846.

Notes from the external lines survey covering boundaries in Houghton and Iron Counties, Michigan (see below for specific townships). These notes were compiled by John Burt in 1846.