Untersuchungen über Angebot und Nachfrage mineralischer Rohstoffe /
Bundesanst. f. Bodenforschung, Hannover, Dt. Inst. f. Wirtschaftsforschung, Berlin.

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Item Link Original Source
Limited (search only)   University of Michigan
Limited (search only)   v.14-16 (Vanadium, Asbest, Niob) University of Illinois at Urbana-Champaign
Limited (search only)   v.17-18 (Tantal, Phosphat) University of Illinois at Urbana-Champaign