Austin, Erastus Long, and Hauser, Odell 1929. The Sesqui-Centennial International Exposition. Current Publications, Inc., Philadelphia. [Baldwin Locomotive Works] 1922 et seq. _Baldwin Locomotives._ (_Baldwin_ with first issue of 1944.) Philadelphia. 1923. History of the Baldwin Locomotive Works, 1831-1923. Printed by the Bingham Co., Philadelphia. [Baltimore and Ohio Rail Road Co.] 1827 et seq. Baltimore and Ohio Rail Road Company annual reports. Baltimore. Bell, J. Snowden 1912. The early motive power of the Baltimore and Ohio Railroad. Angus Sinclair Co., New York. Brown, William H. 1871. The history of the first locomotives in America. D. Appleton and Co., New York. (A second, revised, edition appeared in 1874.) Burgess, George H., and Kennedy, Miles C. 1949. Centennial history of the Pennsylvania Railroad Company. The Pennsylvania Railroad Co., Philadelphia. [Delaware and Hudson Co.] 1925. A century of progress—History of the Delaware and Hudson Company, 1823-1923. Printed by J. B. Lyon Co., Albany, N. Y. Dendy Marshall, C. F. 1928. Two essays in early locomotive history. The Locomotive Publishing Co., Ltd., London. Derrick, Samuel Melanchthon 1930. Centennial history of South Carolina Railroad. The State Co., Columbia, S. C. Forney, M. N. 1886. Locomotives and locomotive building, being a brief sketch of the growth of the railroad system and of the various improvements in locomotive building in America together with a history of the origin and growth of the Rogers Locomotive and Machine Works, Paterson, New Jersey, from 1831 to 1886. Printed by Wm. S. Gottsberger, New York. [German State Railways] 1935. Hundert Jahre deutsche Eisenbahnen. Germany. Harrison, Joseph, Jr. 1872. The locomotive engine, and Philadelphia’s share in its early improvements. George Gebbie, Philadelphia. Hinchman, Walter S. 1913. Holmes Hinkley, an industrial pioneer, 1793-1866. Riverside Press, Cambridge, Mass. Hungerford, Edward 1928. The story of the Baltimore & Ohio Railroad, 1827-1927. G. P. Putnam’s Sons, New York. 1938. Men and iron—The history of New York Central. Thomas Y. Crowell Co., New York. [Pennsylvania Railroad Co.] 1893. Catalogue of the exhibit of the Pennsylvania Railroad Company at the World’s Columbian Exposition. Chicago. Pittenger, William 1893. The Great Locomotive Chase. Jones and Stanley, New [Railway and Locomotive Historical Society] 1921 et seq. Railway and Locomotive Historical Society bulletins. Boston, Mass. Renwick, James 1830. Treatise on the steam engine. G. & C. & H. Carvill, New York. Sagle, Lawrence W. 1952. A picture history of B & O motive power. Simmons-Boardman