Philippines (Republic) Bureau of Public Schools. (1957). Conservation of soil and water for the elementary schools. [s.n.].
Citace podle Chicago (17th ed.)Philippines (Republic) Bureau of Public Schools. Conservation of Soil and Water for the Elementary Schools. Manila: [s.n.], 1957.
Citace podle MLA (9th ed.)Philippines (Republic) Bureau of Public Schools. Conservation of Soil and Water for the Elementary Schools. [s.n.], 1957.
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