Sir Alexander MacKenzie's Journal of a Voyage by Bark Canoe from Lake Athabasca to the Pacific Ocean in the Summer of 1789.  University of Oklahoma  Press.   1966.   First edition.    Twenty-five year old MacKenzie's experiences while searching for an all-water route through North America (Northwestern Canada)  to the Pacific Ocean.   Water stains on  bottom corner of book and dust jacket.  If not for that, the book would be very good+