James St. John:
Coal ball (Duquesne Coal, Upper Pennsylvanian; Steubenville West roadcut, Ohio, USA) 1
James St. John:
Coal ball (Duquesne Coal, Upper Pennsylvanian; Steubenville West roadcut, Ohio, USA) 2
James St. John:
Coal ball (Duquesne Coal, Upper Pennsylvanian; Steubenville West roadcut, Ohio, USA) 3