An edition of Biologicheskoe samoochishchenie i formirovanie kachestva vody = (1975)

Biologicheskoe samoochishchenie i formirovanie kachestva vody =

Biological selft-cleaning [sic] and formation of the water quality : [Materialy simposiuma, 4-6 fevr., 1973 g.

By Vsesoi͡uznyĭ simpozium po sanitarnoĭ gidrobiologii (2nd 1973 Moscow)