EarthWorks Geospatial Catalog

Shaded image of total magnetic field of Ontario.

"Issued 1991." Stock Numbers 10 780, 10 781, 10 782 and 10 783. Includes location map and text. "Project supervision and scientific editing by V.K. Gupta." "Cartography by R. Balgalvis [and three others]." At head of title: Ontario, Ministry of Northern Development and Mines. "Published with the permission of V.G. Milne, Director, Ontario Geological Survey." Includes text and index map.
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