Conservation of soil and water for the elementary schools.

Conservation of soil and water for the elementary schools.

Bibliografiska uppgifter
Institutionell upphovsman: Philippines (Republic) Bureau of Public Schools
Materialtyp: Bok
Språk:English
Publicerad: Manila [s.n.] 1957.
Ämnen:
Soil conservation > Study and teaching.
Water conservation > Study and teaching.