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Sand and Gravel Excavation
John Roy Thoenen
其他書名
Power scraper, slackline cableway excavator, and hydraulic giant
出版U.S. Department of the Interior, Bureau of Mines, 1935
URLhttp://books.google.com.hk/books?id=VkSgEJuhUsYC&hl=&source=gbs_api
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