Map of the coal fields of the United States, compiled from state reports and data specially furnished by Prof. W.B. Rogers, E.T. Cox, A.H. Worthen, S.S. Lyon, Richard Owen, A.B. Roessler, R.P. Rothwell, Jas. MacFarlane, G.C. Swallow and W.C. Kerr, by Charles Hitchcock. To which are added the statistics of coal product for the years ending June 1st compiled from the statistics of industry, ninth census, 1870 by Francis A. Walker. (with) Map of the first and second anthracite coal fields of Pennsylvania. (Julius Bien, Lith., 1874)