01N 13W - Survey Map of Trowbridge Township, Allegan County

A survey map of Trowbridge Township in Allegan County, Michigan. The southern boundary was measured in 1827, the northern, eastern, and western boundaries in late 1830 and early 1831, and the subdivisions in 1831.

A survey map detailing islands in the portion of the Kalamazoo River that runs through sections 3 and 10 of Trowbridge Township in Allegan County, Michigan. This land was measured in 1850.