Narŭchnik po okhrana na truda za otrasŭl "sŭobshtenii͡a︡"
By: D. Velinov, D. Stanchev. Li͡u︡ben Minev.
Contributors: Stanchev, D.; Minev, Li͡u︡ben.
Publisher: Ministerstvo na sŭobshtenii͡a︡
Published: 1984
Place of publication: Sofii͡a︡
Language: bul
Number of pages: 438
Subjects: Telecommunication -- Bulgaria.