![Voussoirs of North Rib, Walnut Lane Bridge [Voussoirs of North Rib, Walnut Lane Bridge]](/images/voussoirs_of_north_rib_walnut_lane_bridge_asce_440_small.jpg)
Description: Voussoirs of North Rib, Walnut Lane Bridge.
Source: George S. Webster and Henry H. Quimby, "Walnut Lane Bridge, Philadelphia" (Transactions of the American Society of Civil Engineers, December 1909, vol. LXV, page 440).
Description: Voussoirs of North Rib, Walnut Lane Bridge.
Source: George S. Webster and Henry H. Quimby, "Walnut Lane Bridge, Philadelphia" (Transactions of the American Society of Civil Engineers, December 1909, vol. LXV, page 440).