Ecology of water weeds in the neotropics :

Ecology of water weeds in the neotropics : An ecological survey of the aquaticweeds Eichhornia Crassipedes and Salvinia species, and their natural enemies in the neotropics / by D. S. Mitchell; P.A. Thomas. - París : UNESCO, 1972. - 50 p. : il. - Technical papers in hydrology ; 12 .

577.472 (7/8) =20 ECO No.12.