An 1873 map of Isabella County, Michigan showing land that will eventually become Nottawa, Deerfield, and Union townships.

Source: Henry Francis Walling and Alexander Winchell, Atlas of the State of Michigan: Including Statistics and Descriptions of its Topography, Hydrography, Climate, Natural and Civil History, Railways, Educational Institutions, Material Resources (R.M. & S.T. Tackabury, circa 1873), Isabella County, micounty-2746566.0001.001-83; digital image, University of Michigan Digital Library, Michigan County Histories and Atlases (http://quod.lib.umich.edu/m/micounty/ : downloaded 3 December 2009.