- CIENCIAS BIOLOGICAS 3
- Ciencias fundamentales 3
- AGRICULTURA 2
- BIOGEOGRAFIA 2
- CIENCIA 2
- CIENCIAS AGRARIAS 2
- Ciencia 2
- Curricular developments 2
- ECOLOGIA 2
- Educación matemática 2
- Publicación periódica 2
- SUELOS 2
- ADAPTACION VEGETAL 1
- AGRONOMIA 1
- AGUA 1
- ASPECTOS ECONOMICOS 1
- ASPECTOS EDUCATIVOS 1
- ASPECTOS SOCIALES 1
- ASTRONOMIA 1
- BIOECOLOGIA 1
- BIOLOGIA 1
- BOTANICA 1
- CIENCIAS FISICAS 1
- CIENCIAS NATURALES 1
- CLIMA 1
- CONGRESOS 1
- CONTROL BIOLOGICO 1
- CONTROL DE PLAGAS 1
- Caries dentales - Flúor - Congresos 1
- DESERTIFICACION 1
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Bioecology of the arid and semiarid lands of the Southwest /
Published 1961Conference Proceeding Book -
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Future of arid lands : papers and recommendations from the International Arid Lands Meetings /
Published 1956“…American Association for the Advancement of Science ;…”
Book -
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15
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Sixth report of the international clearing on science and mathematics curricular developments /
Published 1968Conference Proceeding Book -
20
Report of the International Clearinghouse on science and mathematics curricular developments /
Published 1966Conference Proceeding Book