Symposium on the Productivity of Forest Ecosystems (1969 : Brussels).
Productivity of forest ecosystems = Productivite des ecosystemes forestiers : proceedings of the Brussels symposium organized by Unesco and the International Biological Programme (27-31 October 1969) = Actes du colloque ... / edited by P. Duvigneaud. - Paris : UNESCO, 1971. - 707 p. : ill., maps.
Forest ecology.
Productivity of forest ecosystems = Productivite des ecosystemes forestiers : proceedings of the Brussels symposium organized by Unesco and the International Biological Programme (27-31 October 1969) = Actes du colloque ... / edited by P. Duvigneaud. - Paris : UNESCO, 1971. - 707 p. : ill., maps.
Forest ecology.