LIBROS DEL AUTOR: j m hellawell

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  • Biological Indicators of Freshwater Pollution and Environmental Management
    J. M. Hellawell
    The preface of a book often provides a convenient place in which the author can tender his apologies for any inadequacies and affords him the facility to excuse himself by reminding the reader that his art is long but life, or at least the portion of it in which he has the opportunity for writing books, is short. I, too, am deeply conscious that I hav...
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