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Cooperative Coal Mining Series

Frank Keehn OvitzGilbert Haven CadyGladys Willetta HawleyHarold Eugene CulverLloyd George HenbestWilliam Albert Dunkley

出版	The Survey, 1917
URL	http://books.google.com.hk/books?id=v9-IuwEACAAJ&hl=&source=gbs_api