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The Land Crabs of Costa RicaThe Land Crabs of Costa Rica
(Universidad de Costa Rica, 1966)
An Extraordinary New Toad (Bufo) from Costa RicaAn Extraordinary New Toad (Bufo) from Costa Rica
(Universidad de Costa Rica, 1966)
Notas sobre Kogia breviceps (Cetacea, Physeteridae)Notas sobre Kogia breviceps (Cetacea, Physeteridae)
(Universidad de Costa Rica, 1966)
A List of Lepidoptera collected in Costa RicaA List of Lepidoptera collected in Costa Rica
(Universidad de Costa Rica, 1966)
A survey of three Costa Rican communities for intestinal parasitesA survey of three Costa Rican communities for intestinal parasites
(Universidad de Costa Rica, 1965)