| Ridwan A.R., 2003. Protection of rhinoceros and tiger populations in the Leuser ecosystem. Medan, Leuser International Foundation (Unpublished report), pp. 1-25 (+ annexes)
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| Ridwan A.R., 2003. Protection of rhinoceros and tiger populations in the Leuser ecosystem. Medan, Leuser International Foundation (Unpublished report), pp. 1-25 (+ annexes)
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| Ecosystem Rangers; Ridwan A.R., 2003. Protection of rhinoceros and tiger populations in the Leuser ecosystem. Report 1 September 2002 - 31 January 2003 [in Indonesian]. Medan, Leuser International Foundation (Unpublished report), pp. 1-52
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| Ecosystem Rangers; Ridwan A.R., 2003. Protection of rhinoceros and tiger populations in the Leuser ecosystem. Report 1 February - 31 August 2003 [in Indonesian]. Medan, Leuser International Foundation (Unpublished report), pp. 1-37
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