Ballou, E. (1856). An account of the coal bank disaster at Blue Rock, Ohio: In which four men were buried beneath the hill for two weeks ([6th ed.].). Malta, Ohio: E. Ballou.

Ballou, Ellis. An Account of the Coal Bank Disaster At Blue Rock, Ohio: In Which Four Men Were Buried Beneath the Hill for Two Weeks. [6th ed.]. Malta, Ohio: E. Ballou, 1856.

Ballou, Ellis. An Account of the Coal Bank Disaster At Blue Rock, Ohio: In Which Four Men Were Buried Beneath the Hill for Two Weeks. [6th ed.]. Malta, Ohio: E. Ballou, 1856.