Canada. Division of Seismology and Geomagnetism. http://id.loc.gov/authorities/names/no2016080038
Title:
Total intensity chart 1985.0 : lines of equal total intensity and equal annual change : [magnetic field] : [Canada] / map produced by the Division of Seismology and Geomagnetism, Earth Physics Branch = Carte de l'intensité totale 1985.0 : lignes d'égale intensité totale et variation annuelle : [champ magnétique] : [Canada] / carte produite par la Division de la séismologie et géomagnétisme, Direction de la physique du globe.
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