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Geological and Natural History Survey of Canada. Tyrrell, Joseph Burr, 1858-1957. Geological map of part of Nortern Alberta and portions of the Districts of Assiniboia and Saskatchewan, Northwest Territory; by J.B. Tyrrell; Geological and Natural History Survey of Canada.. [JPEG]. Retrieved from https://geo.nyu.edu/catalog/c03938ed-0c45-4bed-9b01-d4b7f54d9063