R. WellsSurface view of a suction dredge
J. ClaytonDrain weed harvester
P. ChampionLake Opouahi - Photo: P. Champion
Debra GlasgowRob Stewart
R. WellsWeed harvester
P. ChampionManchurian wild rice in flower
from Coffey and Clayton, 1988Swamp willow weed
from Coffey and Clayton, 1988Lemna minor
R. Wells and from Coffey and Clayton, 1988Water hyacinth
R. Wells and from Coffey and Clayton, 1988Water hyacinth
R. WellsSalvinia
