Productivity problems of freshwaters /
Productivity problems of freshwaters /
Editors: Z. Kajak [and] A. Hillbricht-Ilkowska.
- Kraków : PWN, Polish Scientific Publishers, 1972.
- 918 p. : ill. ; 25 cm.
At head of title: International Biological Programme, PF Section--UNESCO. Polish National Committee for the International Biological Programme, PF Section. Institute of Ecology of Polish Academy of Sciences.
At head of title: International Biological Programme, PF Section--UNESCO. Polish National Committee for the International Biological Programme, PF Section. Institute of Ecology of Polish Academy of Sciences.