1. Photocopy from George S. Morison's The Sioux City Bridge, 1890. Photographer unknown, circa 1889. SOUTH WEB AND WEST PORTAL OF BRIDGE
HAER SD,64-SIOCI,1-1 AISSON PIER IV, 60 FEET BELOW WATER LINE, 25 POUNDS AIR PRESSURE
HAER SD,64-SIOCI,1-4 sd/sd0000/sd0018/photos 152545pt.gif w 1 152545pr.jpg|152545pv.jpg|152545pu.tif ʐ 2. Photocopy of photograph, original in the possession of John R. Morison, Peterborough, New Hampshire. Photographer unknown, circa 1889. EAST PORTAL OF BRIDGE
HAER SD,64-SIOCI,1-2 BELOW WATER LINE, 25 POUNDS AIR PRESSURE
HAER SD,64-SIOCI,1-4 sd/sd0000/sd0018/photos 152546pt.gif x2 152546pr.jpg|152546pv.jpg|152546pu.tif ʐ 3. Photocopy from George S. Morison's The Sioux City Bridge, 1890. SITE PLAN OF BRIDGE
HAER SD,64-SIOCI,1-3 pher unknown, circa 1889. EAST PORTAL OF BRIDGE
HAER SD,64-SIOCI,1-2 BELOW WATER LINE, 25 POUNDS AIR PRESSURE
HAER SD,64-SIOCI,1-4 sd/sd0000/sd0018/photos 152547pt.gif w3 152547pr.jpg|152547pv.jpg|152547pu.tif ʐ 4. Photocopy of photograph, original negative in the possession of John R. Morison, Peterborough, New Hampshire. Photographer unknown, 14 September 1888. INSIDE CAISSON PIER IV, 60 FEET BELOW WATER LINE, 25 POUNDS AIR PRESSURE
HAER SD,64-SIOCI,1-4 sd/sd0000/sd0018/photos 152548pt.gif w 4 152548pr.jpg|152548pv.jpg|152548pu.tif ʐ