[en] [Gutenberg 18408] • Transactions of the American Society of Civil Engineers, vol. LXVIII, Sept. 1910 / The Site of the Terminal Station. Paper No. 1157 Createspace Independent Publishing Platform
[en] [DI Robert Colbeck 05] • Murder on the Brighton Express Allison and Busby
[en] [Gutenberg 18229] • Transactions of the American Society of Civil Engineers, Vol. LXVIII, Sept. 1910 / The New York Tunnel Extension of the Pennsylvania Railroad. / Paper No. 1150 Createspace Independent Publishing Platform
[en] [Gutenberg 4684] • The U. P. Trail Ryetown Classics
[en] [DI Robert Colbeck 02] • The Excursion Train Allison and Busby
[en] [DI Robert Colbeck 03] • The Railway Viaduct Allison and Busby
[en] Chapters of Erie · and other essays Boston : J.R. Osgood and Company