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    Welland Ship Canal. Oct. 1925.

    A photograph of Charles Porter at the construction of the Welland Ship Canal (Fourth Canal), Lock 4. Date Unknown.

    A photograph of laying the bed of the Third Welland Canal? Made with hand-made concrete. From the Leeson Collection. c1900.

    A photograph of the construction of one of the early Welland Canals, probably the Third Canal. c1870s.

    A photograph of the sills of the First Canal seen during the Building of the Third Canal? Coffers hold the water back in the old canal until the work is done. c1900 From the Leeson Collection.

    Black and white photo reproduction of the Welland Ship Canal. Piles in substructure Welland South Dock all driven, looking south. Welland Canal, Ontario. January 28, 1933 File Number: 09/pt1/9-5.2

    A photograph of construction on the Welland Ship Canal, Niagara, Ontario. Date Unknown. A bridge can be seen in the distance.

    Different Views of Reinforcing for wing wall harbor Port Weller

    Black and white photo reproduction of the Welland Ship Canal. Driving the last Pile, Welland South Dock, looking west. Welland Canal, Ontario. January 28, 1933. File Number: 09/pt1/9-6.1

    Black and white photo reproduction of the New Welland Ship Canal under construction. Thorold, Ontario. File Number: 09/pt1/7-1.1 See also File Number: 09/pt1/7-1.2

    Black and white photograph of construction on the Third Welland Canal. File Number: 08/pt1/35-1.1

    A photograph of an accident during the construction of the Welland Ship Canal (Fourth Canal) that took place at Lock Six in Thorold, Ontario. August 1928.

    A photograph of an accident during the construction of the Welland Ship Canal (Fourth Canal) that took place at Lock Six in Thorold, Ontario. August 1928.

    A photograph of an accident during the construction of the Welland Ship Canal (Fourth Canal) that took place at Lock Six in Thorold, Ontario. August 1928.

    A photograph of an accident during the construction of the Welland Ship Canal (Fourth Canal) that took place at Lock Six in Thorold, Ontario. August 1928.

    A photograph of an accident during the construction of the Welland Ship Canal (Fourth Canal) that took place at Lock Six in Thorold, Ontario. August 1928.

    A photograph of an accident during the construction of the Welland Ship Canal (Fourth Canal) that took place at Lock Six in Thorold, Ontario. August 1928.

    A photograph of an accident during the construction of the Welland Ship Canal (Fourth Canal) that took place at Lock Six in Thorold, Ontario. August 1928.

    A photograph of an accident during the construction of the Welland Ship Canal (Fourth Canal) that took place at Lock Six in Thorold, Ontario. August 1928.

    A photograph of an accident during the construction of the Welland Ship Canal (Fourth Canal) that took place at Lock Six in Thorold, Ontario. August 1928.