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Yuan, G. (1991). Vertebrates fauna Xinjiang. Urumqi: Xinjiang People's Press.
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Jackson, R. (1991). A wildlife survey of the Qomolangma Nature Preserve, Tibetian Autonomous Region, Peoples Republic of China. Franklin, West Virginia: Woodlands Mountain Institute.
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Oli, M. K. (1991). The ecology and conservation of the snow leopard (Panthera uncia) in the Annapurna Conservation Area, Nepal. Ph.D. thesis, University of Edinburgh, Scotland., .
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Fox, J. L. (1991). Wildlife Ecology Workshop Held in Indias Himalaya Region (Vol. ix). Seattle: Islt.
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Grachev, U. A., & Fedosenko, A. K. (1991). Distribution and Numbers of Snow Leopard in Kazakhstan (Vol. ix). Seattle: Islt.
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Dzhanyspaev, A. D. (1991). Hunting Behavior of the Snow Leopard at the Alma-Atinski Nature Reserve (Vol. ix). Seattle: International Snow Leopard Trust.
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Jackson, R. (1991). Snow Leopards and Other Wildlife in the Qomolang,a Nature Preserve of Tibet (Vol. ix). Seattle: International Snow Leopard Trust.
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Hunter, D. O. (1991). GIS Tracks the Snow Leopard (Vol. ix). Seattle: International Snow Leopard Trust.
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Schaller, G., Li, H., Lipu, T., Ren, J. Qiu, M. (1991). Snow Leopards in Xin Jiang, China. Arid Zone Research, , 74–78.
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Allabergenov E. (1991). The cat family. 1991.
Abstract: It provides field signs and brief comparative characteristic of cat species in Uzbekistan, five of which are included in the Red Data Book of Uzbekistan and the USSR: lynx, caracal, manul, snow leopard and cheetah. Snow leopard is protected in the Zaamin, Chatkal, and Gissar nature reserves. A snow leopard female bears up to five cubs (normally two three) once in two years. Gestation period is 90 days. Female suckles her cubs until they reach the age of three four months.
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