2005. National Atlas of the United States. The Topographic and Bathymetric Shaded Relief of North America map layer shows depth and elevation ranges using colors, with relief enhanced by sha... National Atlas of the United States.
1944. General Drafting Company. Relief shown by shading and spot heights. Map shows international and provincial boundaries, submarine tunnel under construction, approximate cours... New York, N.Y. : General Drafting Co., .