"0, . "
a guide to the study of fresh water ecology: / - 1 ed. - usa : prentice-hall 1972. - "ix, 182p.; 24 cm." - contours:studies of the environment .
0-13-3790866-7 hard cover
fresh-water ecology--
574. 526 32 and
a guide to the study of fresh water ecology: / - 1 ed. - usa : prentice-hall 1972. - "ix, 182p.; 24 cm." - contours:studies of the environment .
0-13-3790866-7 hard cover
fresh-water ecology--
574. 526 32 and