The Dangerous Classes of New York, and Twenty Years' Work Among Them — Charles Loring Brace
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 — James H. Brace
Transactions of the American Society of Civil Engineers, vol. LXVIII, Sept. 1910 / The New York Tunnel Extension of the Pennsylvania Railroad. / The East River Tunnels. Paper No. 1159 — James H. Brace
