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2
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Scientific articles on caoutchouc, guttapercha and balata published in volumes I to XXV (1886/87 to 1910/11) of the Gummi-Zeitung (Berlin) and a bibliography of the entire India-rubber industry / elaborated by R. Marzahn.
- Union Deutsche Verlagsgesellschaft,
- 1911.
- Berlin :
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Deutsch Neu-Guinea / von R. Neuhauss.
- Reimer,
- 1911.
- Berlin :