Mich. Comp. Laws § 570.105

Sec. 5. The words "materials" and "supplies" as used herein shall include coal, wood, form lumber, gasoline, kerosene and lubricating and fuel oils necessarily used in connection with or consumed in constructing, repairing and ornamenting public buildings and public works, and the term "labor" as used herein shall include the hauling other than by steam or electric railway to or away from the public buildings or other public works being built, repaired or ornamented, any refuse, materials or dirt accumulated or used in connection with or consumed in the construction, repairing or ornamentation of such public buildings or other public works.