Conservation of soil and water for the elementary schools.

Conservation of soil and water for the elementary schools.

Xehetasun bibliografikoak
Erakunde egilea: Philippines (Republic) Bureau of Public Schools
Formatua: Liburua
Hizkuntza:English
Argitaratua: Manila [s.n.] 1957.
Gaiak:
Soil conservation > Study and teaching.
Water conservation > Study and teaching.