Pravilnik po bezopasnostta na truda v podzemnite vuglishtni rudnitsi
Subtitle: Tekhnicheski instruktsii
Edition: 2. perer. izd edition
Publisher: Komitet po energetika
Published: 1992
Language: bul
Format: Unknown Binding
ISBN-13: 9789548162043
Subjects: Bulgaria; Mines and mining; Safety regulations