Obituario: Harry Arnold Baylis 1889-1972
Eduardo Caballero y Caballero
Helminth parasites of freshwater fishes. X. On two new trematode parasites of freshwater fishes from Lucknow, India
Sneh Lata Verma
Wirkung von Antiaminosauren auf Trichomonas vaginalis
Chr. P. Christow
Ptychophallus costaricensis, a new freshwater crab from Costa Rica
Carlos R. Villalobos
Floración primera del zacate gigante del Volcán Turrialba, Costa Rica
Richard W. Pohl
Some helminth parasites of Nevada bullfrogs, Rana catesbiana Shaw
Bert B. Babero, Katharina Golling
Lycoperdaceae of Costa Rica. I. The genus Morganella
María Isabel Morales, Maryssia Nassar, J. A. Sáenz
Biochemical and cytogenetic studies of Poecilia from eastern México. I. Comparative microelectrophoresis of plasma proteins of seven species
J. S. Balsano, Ellen M. Rasch
Los cíclidos (Pisces: Pereiformes) de la Laguna de Términos y sus afluentes
Silvia Toral Almazán, Andrés Reséndez Medina
Food habits of some Costa Rican bats
D. J. Howell, Derek Burch
The venomous coral snakes (genus Micrurus) of Costa Rica
Jay M Savage, James L. Vial
Biochemical and cytogenetic studies of Poecilia from eastem Mexico. II. Frequency, perpetuation, and probable origin of triploid genomes in females associated with Poecilia formosa
Ellen M. Rasch, J. S. Balsano
Geographical distribution of Viperidae, Elapidae and Hydrophidae in Costa Rica
Richard T. Taylor, Álvaro Flores Jiménez, Guillermo Flores, Róger Bolaños
Aspects of social behavior in Poecilia latipinna (Lesueur)
Ronald C. Baird
Hemoglobinas anormales en una población estudiantil universitaria
German F. Sáenz, Guido Arroyo González, María de los Angeles Alvarado, Gerardo Montero, Javier Jiménez-Pérez, Eliécer Valenciano
Clave para Falales (Phallales) de Costa Rica
J. A. Sáenz, Maryssia Nassar, María Isabel Morales
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