1 Ergebnisse für: explorationists
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Giant Metallic Deposits: Future Sources of Industrial Metals - Peter Laznicka - Google Books
https://books.google.de/books?id=1tWllDxMkEYC&pg=PA442#v=onepage
Metals in the earth's crust are very unevenly distributed and, traditionally, a small number of ore deposits, districts or countries have dominated the world supply and have influenced commodity prices. The importance of exceptionally large, or rich,…