Can anyone recommend a book on the identification of tropical weeds?

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Narayanan Nair Mohanan

HANDBOOK ON INVASIVE PLANTS OF KERALA by T A Suresh, K V Sankaran and T V Sajeev, published by Kerala Forest Research Institute, Thrissur, Kerala may be helpful to you.

Shivendra Singh

Please see the link bellow.

https://www.google.com/search?q=identification+of+tropical+weeds&num=20&es_sm=93&biw=1366&bih=643&source=lnms&tbm=bks&sa=X&ei=4O21VLuyJI6gugTa6IHoAg&ved=0CA4Q_AUoAQ