 Reference Base  Dr. Johann Wilhelm Helfer's gedruckte und ungedruckte... |
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 | Helfer, J.W., 1859. Dr. Johann Wilhelm Helfer's gedruckte und ungedruckte Schriften uber die Tenasserim Provinzen, den Mergui Archipel und die Andamanen-Inseln. Mitttheilungen der Kaiserlich-Koniglichen Geographischen Gesellschaft zu Wien 3 (3): 260-275
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