US Dept of Interior, Bureau of Land Management
A valuable resource, with map and certificate for each land purchase.

Michigan Land and Property on FamilySearch

History of Lapeer County, Michigan : with illustrations and biographical sketches of some of its prominent men and pioneers (1884) by H. R. Page
This has early land entries prior to 1846 for each township.

Names of property owners can be seen on the 1863, 1874, 1893, 1906 and 1921 plat maps. See the Maps page for links to these.