P.9480	12461	[Allegheny Avenue railroad bridge, Philadelphia]	nitrate negative ; Jennings print	December 26, 1915
P.9480	12463	[Allegheny Avenue railroad bridge, Philadelphia]	nitrate negative ; Jennings print	December 26, 1915
P.9480	12462	[Allegheny Avenue railroad bridge, Philadelphia]	nitrate negative ; Jennings print	December 26, 1915
P.9480	H-129A	[Benjamin Franklin Bridge approach, Camden, N.J.]	safety film negative ?	March 23-26, 1926
P.9480	H-129	[Benjamin Franklin Bridge approach, Camden, N.J.]	safety film negative ; 3 modern prints	March 23, 1926
P.9479	121A	[Benjamin Franklin Bridge over the Delaware River]	safety film negative ; Jennings print	ca. 1925
P.9479	213647	[Benjamin Franklin Bridge over the Delaware River, Philadelphia]	nitrate negative ; modern print	ca. 1925
P.9480	H-121B	[Benjamin Franklin Bridge, Philadelphia]	nitrate negative	ca. 1925
P.9480	119	[Benjamin Franklin Bridge, Philadelphia]	safety film negative	ca. 1926
P.9480	60	[Big Viaduct Bridge over the Little Conemaugh River, Pa.]	glass plate negative	1886
P.9479	C-60	[Camaguey Railroad Bridge, Cuba]	nitrate negative ; Jennings print	1930
P.9479	2673	[Camden Bridge Garage, Camden, N.J.]	safety film negative ; Jennings print	ca. 1928
P.9480	6913	[Charles Street Bridge, Baltimore Union Station of the Pennsylvania Railroad, Baltimore, Md.]	glass plate negative ; digital image	ca. 1925
P.9480	215030	[Christiana Bridge, Christiana, De.]	nitrate negative	ca. 1925
P.9480	7314	[Connecting Pennsylvania Railroad Birdge over the Schuylkill River at Girard Avenue, Philadelphia]	glass plate negative ; modern print	August 29, 1912
P.9480	8308	[Connecting Railroad Bridge over the Schuylkill River]	glass plate negative	September 14, 1897
P.9480	8310	[Connecting Railroad Bridge over the Schuylkill River]	glass plate negative	October 17, 1897
P.9480	137	[Evolution of the Pennsylvania Railroad bridge over the Allegheny River at Kiskiminetas Junction, copy photograph]	glass plate negative - broken	ca. 1925
P.9480	7193	[Girard Avenue Bridge over the Schuylkill River, Philadelphia]	glass plate negative ; modern print	July 26, 1912
P.9480	7194	[Girard Avenue Bridge over the Schuylkill River, Philadelphia]	glass plate negative ; modern print	July 26, 1912
P.9480	7196	[Girard Avenue Bridge over the Schuylkill River, Philadelphia]	glass plate negative ; modern print	July 26, 1912
P.9480	7361	[Grays Ferry Bridge monument, Philadelphia]	glass plate negative	ca. 1925
P.9480	11758	[Gywnne Falls Bridge]	glass plate negative - broken	April 27, 1915
P.9479	1116	[Hell Gate Bridge spanning the East River, New York, NY]	safety film negative ; modern print	January 7, 1928
P.9480	J-60	[Johnstown Flood. Big Viaduct Bridge over the Little Conemaugh River]	glass plate negative	1886
P.9480	J-45	[Johnstown Flood. Little Comemaugh Bridge]	nitrate negative	1889
P.9480	J-44	[Johnstown Flood. Little Conemaugh Bridge]	nitrate negative ; digital image	1889
P.9480	J-65	Johnstown Flood. Little Conemaugh Bridge.	nitrate negative	1889
P.9480	J-64	Johnstown Flood. Penna. R.R. Co. Little Conemaugh Bridge.	nitrate negative	June, 1889
P.9480	11985	[Manayunk Railroad Bridge]	nitrate negative	July 8, 1915
P.9480	11983	[Manayunk Railroad Bridge]	nitrate negative	July 8, 1915
P.9480	11982	[Manayunk Railroad Bridge]	nitrate negative	July 8, 1915
P.9480	11984	[Manayunk Railroad Bridge]	nitrate negative	July 8, 1915
P.9480	214992	[Manayunk Railroad Bridge, Philadelphia]	glass plate negative ; modern print	ca. 1925
P.9479	MJ-24	[Market Street Railroad Bridge over the Schuylkill River, copy photograph]	nitrate negative ; modern print ?	ca. 1925
P.9480	8802	[North Philadelphia Bridge over Broad Street at West Glenside Avenue, Philadelphia]	glass plate negative ; digital image	December 5, 1913
P.9480	214798	[Old Camel Back Bridge over the Susquehanna River, Harrisburg, Pa., copy photograph]	glass plate negative	ca. 1925
P.9480	215822	[Old standard overhead bridge #11, Pennsylvania Railroad Company, unidentified location]	glass plate negative ; digital image	ca. 1925
P.9479	10347	[Pennsylvania Railroad bridge over Wissahickon Creek and Lincoln Drive, Philadelphia]	safety film negative ; 3 modern prints	ca. 1925
P.9479	10348	[Pennsylvania Railroad bridge over Wissahickon Creek and Lincoln Drive, Philadelphia]	safety film negative ; 4 modern prints	ca. 1925
P.9480	1128	[Pennsylvania Railroad Company bridges over the Schuylkill River]	safety film negative	ca. 1925
P.9480	1128A	[Pennsylvania Railroad Company bridges over the Schuylkill River]	safety film negative	ca. 1925
P.9480	12467	[Pennsylvania Railroad Phoenixville Bridge, Phoenixville, Pa.]	nitrate negative	January 3, 1916 ?
P.9480	12466 or 12521 ?	[Pennsylvania Railroad Phoenixville Bridge, Phoenixville, Pa.]	nitrate negative	1916
P.9480	6576	[Perkiomen Stone Arch Bridge, Ridge Pike over Perkiomen Creek, Collegeville, Pa.]	glass plate negative	ca. 1925
P.9480	7945	[Perryville Bridge, Perryville, Pa.]	glass plate negative	ca. 1925
P.9480	12045	[Railroad bridge over Front Street, Harrisburg, Pa.]	nitrate negative	July 28, 1915
P.9480	12052	[Railroad bridge over Front Street, Harrisburg, Pa.]	nitrate negative	July 28, 1915
P.9480	12046	[Railroad bridge over Front Street, Harrisburg, Pa.]	nitrate negative	July 28, 1915
P.9479	214840	[Railroad bridge over the Susquehanna River near Sunbury and Shikellamy State Park, Pa.]	safety film negative ; 3 Jennings prints	ca. 1925
P.9480	1026	[Raritan River Bridge, New Brunswick, NJ, copy photograph]	safety film negative	ca. 1925
P.9480	1043	[Rockville Bridge over the Susquehanna River, Harrisburg, Pa.]	glass plate negative ; digital image	ca. 1925
P.9480	13810	[Rockville Bridge over the Susquehanna River, Harrisburg, Pa.]	glass plate negative ; digital image	April 13, 1917
P.9480	1023	[Rockville Bridge over the Susquehanna River, Harrisburg, Pa.]	safety film negative	ca. 1925
P.9480	1085	[Sixth Street Bridge over the Allegheny River, Pittsburgh, Pa.]	glass plate negative	ca. 1925
P.9480	1024	[Trenton Railroad Bridge, Trenton, N.J.]	nitrate negative	ca. 1925