00699     2200169   4500001002100000008004100021035002000062245024400082100004500326260003700371300005100408084001400459082001000473650002300483990001100506990001200517INLIS000000000023506                                   Ind    a0010-1218005344  aProductivity problems of freshwaters: proceedings of the IBP-UNESCO symposium on productivity prolems of freshwaters hel in Kazimiers Dolny, Polond, May 6-12, 1970cSYMPOSIUM ON PRODUCTIVITY PROBLEMS OF FRESHWATERS (1970 : Kazimiers Dolny)  aEditors Z. Kajak; A. Hillbricth-Ilkowska  aWarsawabPolish Scientificc1972  a918 p. : ill. ; 24 cm.c918 p. : ill. ; 24 cm.  a639.6SYMp  a639.6  aFRESHWATER ECOLOGY  a503/74  a1149/79