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    Photograph from "The Canadian Champion"

    For further information, see "P. L., inventor of the Robertson screw" by Ken Lamb.

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    Lime plant at the foot of cliff on the Escarpment

    The picture was taken by Eva Houston, Clifford's sister. Their father, George Houston, worked at the brickyards for many years.

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    This series of photographs was taken during P. L. Robertson's trip to Scotland in August and September 1918. The photographs are pasted into an album with the following inscription "To Stimulate The

    This series of photographs was taken during P. L. Robertson's trip to Scotland in August and September 1918. They are pasted into an album with the following inscription "To Stimulate The memory of M

    This series of photographs was taken during P. L. Robertson's trip to Scotland in August and September 1918. They are pasted into an album with the following inscription "To Stimulate The memory of M

    This series of photographs was taken during P. L. Robertson's trip to Scotland in August and September 1918. They are pasted into an album with the following inscription: "To Stimulate The memory of

    This series of photographs was taken during P. L. Robertson's trip to Scotland in August and September 1918. They are pasted into an album with the following inscription: "To Stimulate The memory of

    This series of photographs was taken during P. L. Robertson's trip to Scotland in August and September 1918. They are pasted into an album with the following inscription: "To Stimulate The memory of

    This series of photographs was taken during P. L. Robertson's trip to Scotland in August and September 1918. They are pasted into an album with the following inscription: "To Stimulate The memory of

    This series of photographs was taken during P. L. Robertson's trip to Scotland in August and September 1918. They are pasted into an album with the following inscription: "To Stimulate The memory of

    This series of photographs was taken during P. L. Robertson's trip to Scotland in August and September 1918. They are pasted into an album with the following inscription: "To Stimulate The memory of

    This series of photographs was taken during P. L. Robertson's trip to Scotland in August and September 1918. They are pasted into an album with the following inscription: "To Stimulate The memory of

    This series of photographs was taken during P. L. Robertson's trip to Scotland in August and September 1918. They are pasted into an album with the following inscription: "To Stimulate The memory of

    This series of photographs was taken during P. L. Robertson's trip to Scotland in August and September 1918. they are pasted into an album with the following inscription: "To Stimulate The memory of