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19001
Especies y distribución geográfica de Hemicnetha (Diptera: Simuliidae) en Costa Rica
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19002
Comparative foraging behavior of Apis mellifera and Trigona corvina (Hymenoptera: Apidae) on Baltimora recta (Compositae)
by Roubik, David W.
Published 1981
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19003
Lycastopsis riojai, a new species of polychaete (Polychaeta: Nereidae) from the Gulf of California
by Bastida-Zavala, José Rolando
Published 1990
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19004
A quantitative study of the structure of an abandoned cropland in Nigeria.
by Afolayan, A J, Ayandele, K S
Published 1990
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19005
Pérdidas poscaptura en la pesquería artesanal del Golfo Dulce y su proyección al Pacífico de Costa Rica
by Segura, Alvaro, Campos M., Jorge M
Published 1990
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19006
Limnología básica de la Laguna del Barva
by Umaña V., Gerardo
Published 1990
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19007
Morphological and anatomical studies of the seeds and seedlings of Eucalyptus pilularis and E. umbra
by Beltrati, Celia Massa
Published 1981
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19008
Aislamiento de vibrios enteropatógenos de bivalvos y cieno del Golfo de Nicoya, Costa Rica
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19009
El viento como factor ambiental importante en el estudio ecológico del fitoplancton de agua dulce
by Alfonso Marins, Marcos de
Published 1981
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19010
Epiperipatus hilkae, n. Sp. from Costa Rica (Onychophora: Peripatidae)
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19011
Estudio ultraestructural del epitelio digestivo de Taeniopoda y Schistocerca (Saltatoria)
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19012
Diversity and fish community structure in a Central American mangrove embayment
by Phillips, Peter C.
Published 1981
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19013
Estudio ultraestructural en epidídimo de hamster vasectomizado (Mesocricetus auratus)
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19014
Elacatinus janssi, a new gobiid fish from Costa Rica
by Bussing, William A.
Published 1981
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19015
Dinoflagellate abundance in the Laguna Botos, Poás Volcano, Costa Rica
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19016
Cambios post mortem en mucosa intestinal y tejido pulmonar de Mus musculus, observados al microscopio electrónico de barrido
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19017
Adaptación natural de rata blanca a Toxoplasma gondii
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19018
Phytochemical screening of Costa Rican plants: Alkaloid analysis. VI.
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19019
Phyllachora stahlii (Chardon) Stevenson, parásito de Ficus goldmanii: nuevo registro para Costa Rica
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19020
Estudio de esporas de seis especies de Falales (Phallales) al microscopio electrónico de barrido
by Sáenz, J. A., Sáenz Gómez, Vera
Published 1981
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