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Elliott R. Jacobson, Juergen Schumacher, Mary Green, Field and Clinical Techniques for Sampling and Handling Blood for Hematologic and Selected Biochemical Determinations in the Desert Tortoise, Xerobates agassizii, Copeia, Vol. 1992, No. 1 (Feb. 3, 1992), pp. 237-241
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Jacobson et al. (1992) studied this question.
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