p s harikumar

P. S. Harikumar · Kerala State Council for Science, Technology, and Environment

133 sayfa · 2010

Water quality

P. S. Harikumar · Centre for Water Resources Development & Management

174 sayfa · 2009

Environmental Monitoring Programme on Water Quality / Evaluation / Water quality

P. S. Ajith, P. N. Harikumar · Abhijeet Publications

348 sayfa · 2016

Refuse and refuse disposal