Conservation of soil and water for the elementary schools.

Conservation of soil and water for the elementary schools.

Bibliografiset tiedot
Yhteisötekijä: Philippines (Republic) Bureau of Public Schools
Aineistotyyppi: Kirja
Kieli:English
Julkaistu: Manila [s.n.] 1957.
Aiheet:
Soil conservation > Study and teaching.
Water conservation > Study and teaching.