TY  - BOOK
AU  - Riggs,Calvin Harold
TI  - Geology of Allegan county,
T2  - Michigan. Dept. of Conservation. Geological survey division. Progress report,
AV  - TN24.M5 A34 no. 4
U1  - 553/.09774 
PY  - 1938///
CY  - [Lansing]
KW  - Geology
KW  - Michigan
KW  - Allegan County
N1  - cover-title; At head of title: State of Michigan. Department of conservation ... Geological survey division; Photoprinted; Folded maps and plans in pocket
ER  -