Powered roof supports today - and tomorrow roadheads, shortwall, steep seams and the future : Sheperd, R Mine Quarry V6, N4, April 1977, P25–30

• Book ID: 103561305
• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 104 KB
• Volume: 14
• Category: Article
• ISSN: 0148-9062
• DOI: 10.1016/0148-9062(77)91062-2