Title: Optimizat︠s︡ii︠a︡ bibliotechno-bibliograficheskoĭ klassifikat︠s︡ii i ee adaptat︠s︡ii︠a︡ k nat︠s︡ionalʹnoĭ spet︠s︡ifike sot︠s︡ialisticheskikh stran
Subjects: Congresses, BBK Classification