Transactions of the American Society of Civil Engineers, Vol. LXVIII, Sept. 1910 : The New York Tunnel Extension of the Pennsylvania Railroad. The Cross-Town Tunnels. Paper No. 1158 [electronic resource] /
James H. Brace
- Project Gutenberg, 2006
- Project Gutenberg 19037 .
Public domain in the USA.
Electronic text
Civil engineering -- Periodicals Railroad tunnels -- Design and construction