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Houston Zoological Society. (1979). Houston's summer snow.
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Hansen, J. (1980). The snow leopard study, part one.
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Chubykina, H. L., Shilo, R.A. (1981). A study of diurnal activity rhythms in snow leopards and lynx (Panthera uncia and Felix lynx) at Novosibirsk Zoo. International Zoo Yearbook, 21, 193–196.
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Clevenger, S., S. (1979). Breeding snow leopards in the north 40.
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