A text book of environmental science : P C Joshi, Namita Joshi (Based on UGC prescribed core module syllabus for the under graduate students of all dicipline) / Joshi, P. C. Joshi, Namita. Ecology. Ecosystem. Environmental pollution. 372.357 JOT Includes bibliographical references. New Delhi : A. P. H., 2009. 2009. 2009 Text v, 308 p. ; eng