Title: III nat︠s︡ionalna nauchno-tekhnicheska konferent︠s︡ii︠a︡ s mezhdunarodno uchastie na tema Mekhanizat︠s︡ii︠a︡ na zhilishtnoto i promishlenoto stroitelstvo, 19-21.X.1979 g., Plovdiv
Subjects: Building, Congresses, Construction equipment