00529naa#a2200181#i#450# EN\INFRA-M\bibl\2906 /en/manage/index 20250502231026.5 1998-0728 20140617b2014####ek#y0engy0150####ca RUS RU How to Deal with Primary Sources at Elementary School Journal article Moscow INFRA-M Academic Publishing LLC. 2014 3 с. Journal article local Solovev Yakov test.editorum.ru /en/manage/index