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1975
Frenkel, J. K., Frenkel J. K., & Chinchilla M. (1975).  Soil survival of toxoplasma oocysts in Kansas and Costa Rica. The American Society of Tropical Medicine and Hygiene. 24,
Frenkel, J. K., Frenkel J. K., & Chinchilla M. (1975).  Soil survival of toxoplasma oocysts in Kansas and Costa Rica. The American Society of Tropical Medicine and Hygiene. 24,