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Petrological Investigations of the Coalmeasures Sediments of South-Limburg, the Netherlands
Nicolaas Heertjes
出版E. van Aelst, 1942
URLhttp://books.google.com.hk/books?id=XXlWkfEH0LoC&hl=&source=gbs_api
註釋"Samenvatting": pages 80-81.