Cooperative Mining Series

Bulletin [1]-33

• ISBN 10 : CORNELL:31924004702969
• Judul : Cooperative Mining Series
• Sub Judul : Bulletin [1]-33
• Pengarang : Illinois State Geological Survey,  
• Kategori : Coal mines and mining
• Bahasa : en
• Tahun : 1919
• Halaman : 0
• Google Book : http://books.google.co.id/books?id=RMdPAAAAYAAJ&dq=intitle:COOPERATIVE+LEARNING&hl=&source=gbs_api
• Ketersediaan :

It is not safe to open any property in the county without learning the facts in
regard to these two uncertain elements. Carelessness in this regard may result in
the operator suddenly finding himself without adequate roof and even without
coal.