| Olney, P.J.S., 1987. Mammals bred in captivity and multiple generation births in 1984. International Zoo Yearbook 26: 495
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| Olney, P.J.S., 1987. Census of rare animals in captivity in 1985. International Zoo Yearbook 26: 537-538
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| Olney, P.J.S., 1986. Mammals bred in captivity and multiple generation births in 1982/1983. International Zoo Yearbook 24/25: 546
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| Olney, P.J.S., 1986. Census of rare animals in captivity in 1983/1984. International Zoo Yearbook 24/25: 609-610
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| Olney, P.J.S., 1984. Mammals bred in captivity and multiple generation births in 1981. International Zoo Yearbook 23: 330
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| Olney, P.J.S., 1984. Census of rare animals in captivity in 1982. International Zoo Yearbook 23: 366-367
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| Olney, P.J.S., 1982. Mammals bred in captivity and multiple generation births in 1980. International Zoo Yearbook 22: 428
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| Olney, P.J.S., 1982. Census of rare animals in captivity in 1981. International Zoo Yearbook 22: 465-466
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| Olney, P.J.S., 1981. Mammals bred in captivity and multiple generation births in 1979. International Zoo Yearbook 21: 438
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| Olney, P.J.S., 1981. Census of rare animals in captivity in 1980. International Zoo Yearbook 21: 361-362
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| Olney, P.J.S., 1980. Mammals bred in captivity and multiple generation births in 1978. International Zoo Yearbook 20: 438
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| Olney, P.J.S., 1980. Census of rare animals in captivity in 1979. International Zoo Yearbook 20: 476-477
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| Olney, P.J.S., 1979. Census of rare animals in captivity in 1978. International Zoo Yearbook 19: 415-416
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| Olney, P.J.S., 1979. Mammals bred in captivity and multiple generation births in 1977. International Zoo Yearbook 19: 370
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| Olney, P.J.S., 1978. Mammals bred in captivity and multiple generation births in 1976. International Zoo Yearbook 18: 392
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| Olney, P.J.S., 1978. Census of rare animals in captivity in 1977. International Zoo Yearbook 18: 434-434
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| Olney, P.J.S., 1977. Mammals bred in captivity and multiple generation births in 1975. International Zoo Yearbook 17: 322
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| Olney, P.J.S., 1977. Census of rare animals in captivity in 1976. International Zoo Yearbook 17: 363-364
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| Olney, P.J.S., 1976. Mammals bred in captivity and multiple generation births in 1974. International Zoo Yearbook 16: 399
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| Olney, P.J.S., 1976. Census of rare animals in captivity in 1975. International Zoo Yearbook 16: 438-439
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