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| Author | Title | Year | Publication | Volume | Pages |
|---|---|---|---|---|---|
| Aspinall, J. | Some aspects of breeding tigers and other big cats | 1978 | Friends of Howletts and Port Lympne | 1 | 26-32 |
| Woodland Park Zoo | No vacancy | 1980 | |||
| Encke, B. | Die sucht von schneeleoparden (Uncia uncia) im Krefelder Tierpark | 1967 | Freunde des Kolner Zoo | 9 | 145-146 |
| Encke, B. | The breeding of snow leopards (Uncia uncia) in the Krefeld Zoo | 1966 | Freunde des Kolner Zoo | 9 | 145-146 |