00418    a2200145   4500020001500000082001600015100001700031245009100048260003400139300002100173650001100194650001900205650001800224650003000242  a8177540572  a581.76bGUP  aGupta, O. P.  aWeedy aquatic plantsbtheir utility, menace and managementb a reference cum text book  aJodhpurbAgrobiosc2001g2001  a[xi],273p.c24cm  aPlants  aAquatic plants  aPlant ecology  anatural history of plants