Putong, Cecilio, 1891-
Living in our world / by Cecilio Putong, Carmen de la Pena, Isabel I. Fajardo. - Manila : Bookman, 1968. - v, 353 p. : ill., maps
Includes index.
Man--Influence on nature
Earth
Conservation of natural resources
Living in our world / by Cecilio Putong, Carmen de la Pena, Isabel I. Fajardo. - Manila : Bookman, 1968. - v, 353 p. : ill., maps
Includes index.
Man--Influence on nature
Earth
Conservation of natural resources