John D. Hartman’s New Philadelphia Flour Mill depicted on the 1926 Sanborne Fire Insurance map. (Source: loc.gov)

John D. Hartman's New Philadelphia Flour Mill depicted on the 1926 Sanborne Fire Insurance map. (Source: loc.gov)

John D. Hartman’s New Philadelphia Flour Mill depicted on the 1926 Sanborne Fire Insurance map. (Source: loc.gov)

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