English: Soviet-AKM-47-Assault-Rifle-Manual-Kalashnikov-1970. official
日付
原典
Internet papers public domain documents site
作者
USSR/CCCP Government "official documents of state government agencies and local government agencies of municipal formations, including laws, other legal texts, judicial decisions, other materials of legislative, administrative and judicial character, official documents of international organizations, as well as their official translations;"
First and second page clearly states that this official work of Soviet Union Government, with character of administrative/legal texts, being official instruction/document, which made it copyright exemption(also because of subject).