EarthWorks Geospatial Catalog

Vertical magnetic gradient of Ontario [cartographic material] / project supervision and scientific editing by V.K. Gupta, Ontario Geological Survey ; processing, software programming, and grid generation was carried out, under contract, by Paterson, Grant, and Watson Ltd., Toronto ; a computer dithering technique to prepare colour images suitable for commercial printing was developed jointly by R. Balgalvis, Ontario Geological Survey, and GEOSOFT Inc., Toronto ; compilation and editing of marginal text by B. Sifrer and S.E. Neufeld ; cartography by R. Balgalvis ... [et al.], Ontario Geological Survey = Gradient magnétique vertical de l'Ontario / direction du projet et révision scientifique par V.K. Gupta, Commission géologique de l'Ontario ; le traitement, la programmation du logicel et la production du quadrillage ont été exécutés, sous contrat, par Paterson, Grant, and Watson Ltd., Toronto ; le développement du logiciel a été exécuté, sous contrat, par GEOSOFT Inc., Toronto ; une technique informatisée de mise au point pour la préparation des images en couleurs convenant à l'impresion commerciale a été développée conjointement par R. Balgalvis, Commission géologique de l'Ontario et GEOSOFT Inc., Toronto ; compilation et révision du texte marginal par B. Sifrer et S.E. Neufeld ; cartographie par R. Balgalvis ... [et al.], Commission géologique de l'Ontario.

"Issued 1991." Stock Numbers 10 784, 10 785, 10 786 and 10 787. "This map is one of a set published to mark the 1991 centennial of the establishment of an Ontario Bureau of Mines. It was produced specifically to accompany The Geology of Ontario, Ontario Geological Survey, Special volume 4." Copyright: Queen's Printer for Ontario, 1991. Includes location map and text. Title, legend, text, bibliography, and index map in French on verso.
Ontario, Ministry of Northern Development and Mines
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