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Postcard of the Diamond Coal Co., with the postmark from the back bleeding through. Horses and wagons line up to transport the coal. Diamond Coal Company was located off Stringtown Rd. , near the city limits in Pigeon Township. An Underground Coal Mine List for Vanderburgh County, Indiana shows mines owned by Diamond Coal from 1886-1929. (https://igs.indiana.edu/CMIS/Counties/Vanderburgh/VanderburghUndergroundMineList.pdf)