00942cam a22002771 4500 gs 39000104 DLC 20260227111344.0 771001s1938 miubde 000 0 eng gs 39000104 (OCoLC)3309795 DLC UU DLC premarc TN24.M5 A34 no. 4 553/.09774 Riggs, Calvin Harold, 1905- Geology of Allegan county, by C. H. Riggs. [Lansing] 1938. 29numb. 1. incl. tables. 8 fold. maps, 5 fold. plans. 28 cm. Michigan. Dept. of Conservation. Geological survey division. Progress report, no. 4 cover-title. At head of title: State of Michigan. Department of conservation ... Geological survey division. Photoprinted. Folded maps and plans in pocket. Geology Michigan Allegan County. 27526 27526