00464naa#a2200157#i#450# EN\\bibl\46967 20240503134346.5 1681-1208 20080825b2008####ek#y0engy0150####ca RU Chart-making of the Earth's main magnetic field Journal article Moscow Geophysical Center of the Russian Academy of Sciences 2008 16 с. Journal article local Zhalkovsky Ye A rjes.ru