Content Description The Charles W. Martin collection is composed of topographic base maps, detailed geologic maps, thin sections, thin section notes, and field notes collected during Professor Martin’s years as a graduate student in the late 1950s at the University of Wisconsin-Madison and continuing through part of his career as a Professor of Geology at Earlham College. These research materials support Professor Martin’s authorship of three of the bedrock geology quadrangle maps in Connecticut: the Winsted...