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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.

    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.

    A postcard of a bird's eye view of Locks Four, Five, Six and Seven on the Welland Ship Canal (fourth canal) where the ships climb the mountain, Thorold, Ontario. Date Unknown. Published by Peterborough Airways, Ltd., Peterborough, Ontario. Printed in Canada.