Title: Osnovopolozhnit͡s︡i na obuchenieto po fizika v Bŭlgarii͡a︡
Subjects: History, Physics
Places: Bulgaria
People: Gruev, Ĭoakim (1828-1912), Ivan Gi︠u︡zelev (1844-1916), Naĭden Gerov (1823-1900)