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For whatever it's worth, in 1918 the husband of a 2nd cousin 2x removed of mine, when filling out his WWI draft registration, gave his employer and place of work as the "Carnegie Coal Co" at "719 Oliver Bldg Pittsburg Alleg Pa." That suggests to me that perhaps Carnegie Steel had offices there, though apparently their main location was elsewhere.
Poihths (talk) 16:50, 14 November 2021 (UTC)[reply]