01017cam a2200265 4500 1255350 BD-DhUL 20170418102729.0 730524s1971 fr a b 100 0 eng 73160364 F*** DLC DLC DLC BD-DhUL 581.5 PRO Symposium on the Productivity of Forest Ecosystems, Brussels, 1969. Productivity of forest ecosystems : Productivité des écosystèmes forestiers. Proceedings of the Brussels symposium organized by Unesco and the International Biological Programme (27-31 October 1969) / Edited by P. Duvigneaud. Paris : Unesco, 1971. 707 p. ; 27 cm. Ecology and conservation, 4 Includes bibliographies. Forest ecology Congresses. Forest productivity Congresses. International Biological Programme. Productivité des écosystèmes forestiers. ddc REF 184516 184516 0 0 ddc 0 581_500000000000000_PRO 0 REF 320700 DUL DUL UNC 2017-04-18 Gift 581.5 PRO D18498 2017-04-18 2017-04-18 REF