Salpekar, Aaradhana Encyclopaedia of ecology and environment / Bharatiya Khadi Gramodyog Vikas Abhikaram, Vol. 9 research methodology and systems analysis - New Delhi: Bharatiya Khadi Gramodyog Vikas Abhikaram, 2007 - 340p. Subjects--Topical Terms: Encyclopaedia Subjects--Index Terms: Environment Universal Decimal Class. No.: R 502.2/.7(031) / P7.9