http://quod.lib.umich.edu/m/micounty/
Atlas of Gratiot County, Michigan / compiled by E. L. Hayes ; assistants: E. W. Dixon, Wm. T. Pitt.
Hayes, E. L., Dixon, E. W., Pitt, Wm. T., Bourquin, F. (Frederick), b. 1808., Bracher, Wm. (William), Lake & Hayes.
Philadelphia, Pa.: Lake & Hayes, 1889.
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