Title: Postizhenii︠a︡ na naukata i tekhnicheskii︠a︡ progres v Narodna Republika Bŭlgarii︠a︡ /
Authors: Todorov, Ivan Mladenov.; Nikolov, Emil,; Iliev, Krŭsti͡u,
Publisher: Dŭrzh. Izd-vo "Tekhnika,"
Year: 1982
Subjects: Science Bulgaria.; Technology Bulgaria; Technological innovations Bulgaria