2010. National Geophysical Data Center. This line shapefile shows lines of equal annual change (secular variation), in the total field intensity of the Earth's magnetic field, derived fro... National Atlas of the United States.
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2010. National Geophysical Data Center. This line shapefile shows lines of equal annual change (secular variation) in the vertical component of the total field intensity of the Earth's ma... National Atlas of the United States.
2010. National Geophysical Data Center. This shapefile contains isodynamic lines (lines of equal total intensity of the Earth's magnetic field), derived from the International Geomagnetic... National Atlas of the United States.
2010. National Geophysical Data Center. This line shapefile shows lines of equal vertical intensity of the Earth's magnetic field, derived from the International Geomagnetic Reference Fie... National Atlas of the United States.
1921. Canada. Natural Resources Intelligence Branch. Inset: "Map of Manitoba showing Dominion Land Agencies." 94 x 63 centimeters Scale 1:792,000; 12 1/2 miles to 1 inch General Map Collection. The Branch (Ottawa).
1877. Barlow, Robert, 1813-1883. Greenwich prime meridian.; Relief shown by hachures and spot heights.; Includes 3 profiles. 77 x 88 centimeters Scale approximately 1:250,000 Gener... Geological Survey of Canada (Ottawa).
1898. Geological Survey of Canada. Relief shown by contours.; Trails; Indian villages; posts; topography; notes; etc.; First edition, 1889; to accompany report number 629.; Contents:... Geological Survey (Ottawa).
1855. Maclear & Co. Scale [ca. 1:1,520,640]; 1 map; 44 x 57 cm Canada, Eastern--Maps. Maclear & Co.
1855. Maclear & Co. Scale [ca. 1:1,520,640]; 1 map; 44 x 57 cm Canada--Maps. Published by Maclear & Co.
1927. Canada. Natural Resources Intelligence Branch. Insets: The Cobalt-Porcupine-Rouyn area. Scale [approximately 1:1,100,000] -- The Sudbury area. Scale [approximately 1:1,100,000]. 33 x 60 Centimet... Dept. of the Interior (Ottawa).