A review of the immunology of parasitic nematodes
Darío Valdivieso, J. R. Tamsitt
A contribution to the morphology of the eggs and nymphal stages of Porocephalus stilesi Sambon, 1910 and Porocephalus clavatus (Wyman, 1847) Sambon, 1910 (Pentastomida)
Mario Vargas V
A double metacercarial infection in an Indian fresh water fish, Heteropneustis fossilis (Bloch)
K. K. Chakrabarti
Notas sobre la historia natural de la serpiente de los pantanos, Tretanorhinus nigroluteus
Jaime Villa
Contribuciones a la Pteridología costarricense. I. Nuevas especies
Luis D Gómez P
Report of the chromosome numbers of some Costa Rican anurans
Pedro E. León
Studies on the pulmonary surface-active lipoprotein I. Isolation and chemical characterization of its constituents
José Miguel Jiménez
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