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1. La enseñanza agricola en la escuela primaria.

by Union Panamericana. Division de Educacion | Union Panamericana.

Edition: 2a ed.Material type: book Book Publisher: Washington : Union Panamericana, 1955Availability: Items available for loan: [Call number: UP 372.8:63 En59e2] (1).

2. La escuela primaria y la conservación de los recursos naturales.

by Union Panamericana. Division de Educacion | Union Panamericana.

Material type: book Book Publisher: Washington : Union Panamericana, 1954Availability: Items available for loan: [Call number: UP 372 Es74] (2).

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