Backscatter strength and shaded seafloor relief, Nanaimo, British Columbia [cartographic material] / author, K. Picard ; Geological Survey of Canada.
- In upper margin: "Natural Resources Canada, Fisheries and Oceans Canada = Ressources naturelles Canada, Pêches et Océans Canada. Relief shown by contours and spot heights; depth by isolines, and gradient tints. Includes location map and National Topographic System reference index, text, 2 col. ill.
- Geological Survey of Canada
- Held by
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