No date: "Of the two 70-ft. open platform type steel observation towers, only one was erected. It was not convenient or practical to erect the other one which is to replace a wooden tower on Black Knob Mountain on the Dumoine River." (Report of the Ottawa River Forest Protective Association, Ltd)
No date: ".... hand from 1947, were erected, replacing wooden towers at the following places: 1 open platform type at Black Knob Mountain, Magnissippi River." (Report of the Ottawa River Forest Protective Association, Ltd)
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