Calculating the roof sag in working spaces of longwall faces in flat-lying seams

✍ Scribed by Yu. F. Savenko; V. I. Chernyaev

• Publisher: Springer
• Year: 1969
• Tongue: English
• Weight: 303 KB
• Volume: 5
• Category: Article
• ISSN: 1573-8736
• DOI: 10.1007/bf02501900