Reports of comprehensive Michigan Railroad Appraisal, providing evaluations of every railroad in the state, directed by Mortimer E. Cooley at the request of Governor Hazen Pingree; also appraisals of plank roads and canals built in Michigan.
The record group consists of nine volumes of Michigan railroad appraisal reports. The appendix titled "List of Physical Items Inventoried" lists the types of property, machinery and equipment inventoried in the appraisals.