These are Square Raised Nails,some of them are marked "unknown" If you have any information on those nails, or find a discrepancy, please e-mail me.

Unknown	Virginia Electric Power Company, Arlignton, VA	Indiana-Michigan Electric Company	Union Pacific RR
Utah Power      & Light	Utah Power      & Light	Pennsylvania RR	Taylor-Colquitt Company
Union Telephone Smackover, AR	Union Pacific RR