Johnson, W. R. (1844). A report to the Navy Department of the United States, on American coals applicable to steam navigation, and to other purposes. Washington: Printed by Gales and Seaton.

Johnson, Walter Rogers. A Report to the Navy Department of the United States, On American Coals Applicable to Steam Navigation, and to Other Purposes. Washington: Printed by Gales and Seaton, 1844.

Johnson, Walter Rogers. A Report to the Navy Department of the United States, On American Coals Applicable to Steam Navigation, and to Other Purposes. Washington: Printed by Gales and Seaton, 1844.