Map showing Course of the Ancient St. Lawrence and its Tributaries
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- Map showing Course of the Ancient St. Lawrence and its Tributaries
- Illustration from J. B. Mansfield, ed., History of the Great Lakes. Volume I, Chicago: J. H. Beers & Co., 1899
- Map of Laurentian River (Ancient St. Lawrence and its Tributaries) by J. W. Spencer. Direction of Glaciation. Elevations in feet above Sealevel. aa Escarpment (450' High) Submerged beneath LAKE HURON bb. Escarpment Submerged beneath LAKE ONTARIO
- J. H. Beers & Co.
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- Copyright status unknown. Responsibility for determining the copyright status and any use rests exclusively with the user.
Maritime History of the Great Lakes