Caption (on front of photo) "32 - Dragline excavation under Southern Pacific main line tracks at First Street showing temporary support of tracks preliminary to the installation of the steel plate girders subsequently used for supporting these tracks." Text; (On back of photo) "Camera 8 x 10, Lens 24", Scene, S.P.ry. & Wester Pacific Ry., bridges in foreground and other Tube activites in further distance, Loacation of Camera; In center of Harrison about 100 ft., south of S.P. Co., bridge, pointed due north, Print 8 x 10 contact Date Aug. 1st."
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