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    A postcard of a bird's eye view of Lock One of the Welland Ship Canal (fourth canal) showing the entrance for up-bound Great Lakes and ocean going vessels. Port Weller, St. Catharines, Ontario. 1965. Published by the Peterborough Post Card Co., Peterborough, Ontario. File Number: 09/pt1/22-1.1

    A postcard of a bird's eye view of Lock Three on the Welland Ship Canal (fourth canal) on the St. Lawrence Seaway, St. Catharines, Ontario. 1969. Published by Peterborough Airways Ltd., Peterborough, Ontario. File Number: 09/pt1/25-1.1

    A postcard of the Twin Flight Locks - where ships climb the mountain - on the Welland Ship Canal (fourth canal), Thorold, Ontario. c1960. Published by L.F. Charter, R.R. 4, Picton, Ontario. Printed in Canada. File Number: 09/pt1/26-1.5

    A postcard of the Twin Flight Locks on the Welland Ship Canal (fourth canal), Thorold, Ontario. c1968. A Lake Ontario bound ship in the background is waiting to be lowered and a Lake Erie bound ship in the foreground is partially raised to the middle level of the locks. Published ...