Transactions of the American Society of Civil Engineers, Vol. LXVIII, Sept. 1910 :
Raymond, Charles W.
Transactions of the American Society of Civil Engineers, Vol. LXVIII, Sept. 1910 : The New York Tunnel Extension of the Pennsylvania Railroad. Paper No. 1150 [electronic resource] / Charles W. Raymond - Project Gutenberg, 2006 - Project Gutenberg 18229 .
Public domain in the USA.
Electronic text
Civil engineering -- Periodicals Railroad tunnels -- Design and construction
TA
Transactions of the American Society of Civil Engineers, Vol. LXVIII, Sept. 1910 : The New York Tunnel Extension of the Pennsylvania Railroad. Paper No. 1150 [electronic resource] / Charles W. Raymond - Project Gutenberg, 2006 - Project Gutenberg 18229 .
Public domain in the USA.
Electronic text
Civil engineering -- Periodicals Railroad tunnels -- Design and construction
TA