Blue line print. Includes 2 columnar sections and an index to "Producers of crushed stone.", Imprint: [Bloomington] : The Survey, 1968., Dimensions: 52 x 64 cm; Scale: 1:1,000,000
French, Robert R. (1968). Locations of crushed stone operations in Indiana. The Survey. https://purl.dlib.indiana.edu/iudl/images/VAC3073/VAC3073-M-00834 (map)