| Burchfield, P. M. (1975). Hatching the radiated tortoise testudo radiata at the brownsville zoo. International Zoo Yearbook, 15, 90–29. |
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| Added by: Admin 06 Jan 2014 18:22:40 UTC |
Pop. 3.25%
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| Burchfield, P. M., Doucette, C. S., & Beimler, T. F. (1980). Captive management of the radiated tortoise geochelone radiata at gladys porter zoo, brownsville. International Zoo Yearbook, 20, 146. |
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| Added by: Admin 24 Aug 2008 18:46:08 UTC |
Pop. 2.75%
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| Hairston, C., & Burchfield, P. M. (1989). Management and reproduction of the galapagos tortoise geochelone elephantopus at the gladys porter zoo. International Zoo Yearbook, 28, 70–77. |
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| Added by: Admin 23 Aug 2008 19:58:38 UTC |
Pop. 2.25%
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| Robeck, T. R., Rostal, D. C., Burchfield, P. M., Owens, D. W., & Kraemer, D. C. (1990). Ultrasound imaging of reproductive organs and eggs in galapagos tortoise, geochelone elephantopus ssp. Zoo Biology, 9, 349–360. |
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| Last edited by: Beate Pfau 18 Jul 2009 09:19:19 UTC |
Pop. 3%
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| Rostal, D. C., Robeck, T. R., Grumbles, J. S., Burchfield, P. M., & Owens, D. W. (1998). Seasonal reproductive cycle of the galapagos tortoise (geochelone nigra) in captivity. Zoo Biology, 17, 505–517. |
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| Added by: Admin 17 Aug 2008 18:54:57 UTC |
Pop. 2.5%
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