 Reference Base  Report on a survey trip to Riau area and the Mt Leuser Re... |
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 | Schenkel, R. et al., 1969. Report on a survey trip to Riau area and the Mt Leuser Reserve to check the situation of the Sumatran rhino and the Orang utan (21 August to 13 Septembr 1969). Report to WWF -, pp. 1-7
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