00286nam a2200109 a 450000500170000008200200001710000150003724500520005225000110010426000360011530000250015120251203091038.0  a632.58,bD, gup  aGupta O.P.  aAquatic weed management: a text book and manual  a2nd ed  aDelhibToday & Tommorow'sc1987  a244p, 22cme47plates