Description
Item Description:Relief shown by contours. Depths shown by isolines.
"A publication of the Decade of North American Geology Project, which is funded, in part, by the G.S.A. Foundation."
From envelope: Continent-scale map-006.
"Base from U.S. Geological Survey"--Lower left.
Physical Description:1 map on 4 sheets : illustrations, color ; 166 x 148 cm, sheets 110 x 94 cm, folded in envelope 31 x 25 cm.
Bibliography:Includes bibliographical references.