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The United States Foreign Trade in Copper by Classes and Countries, 1790-1932
Robert Bunnell Pettengill
其他書名
An Explanation of Trends and Fluctuations ...
出版Leland Stanford junior university., 1934
URLhttp://books.google.com.hk/books?id=7nlEAQAAIAAJ&hl=&source=gbs_api