| Lahan, P., 1993. Present status and distribution of the Indian rhinos (Rhinoceros unicornis) in the wild in Assam and its habitat. Report to the Assam Forest Department , pp. 1-48
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| Lahan, P.; Sonowal, R.N., 1973. Kaziranga Wild Life Sanctuary, Assam: a brief description and report on the census of large animals (March 1972). Journal of the Bombay Natural History Society 70 (2): 245-278, tables 1-6
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