The Coal-mining Industry
نویسندگان
چکیده
منابع مشابه
Productivity Trends in the Coal Mining Industry in Canada
......................................................................................................................................... iii Executive Summary.........................................................................................................................v I. Literature Review of Studies on Productivity in the Coal Mining Industry ........................1 A. Anton (198...
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ژورنال
عنوان ژورنال: Nature
سال: 1921
ISSN: 0028-0836,1476-4687
DOI: 10.1038/107763a0