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3. Environmental control in tropical countries;Bond,1967
4. De Portal, C., 1966. Performance of light and heavy layers managed on the floor and in individual cages. Men. VI. J. Agron., Maracaibo, 1966 Vol. 4 (Zootec.) : 53 pp. (Translation cited in Animal Breeding Abstract 36 [1] No. 822 p. 131).
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