A 1976 photograph of the executive office of the Kocher Coal Company, Millersburg, Dauphin County, Pennsylvania. The back wall of the office appears to be a replica of the inside of a coal mine.
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From the 1976 Susquehannock, the yearbook of Millersburg High School, available in digital form on Ancestry.com.
Corrections and additional information should be added as comments to this post.