Why recycle? proceedings of the Recycling Annual Seminar, Birmingham, United Kingdom, 17 February 1994

Reclamation, treatment and utilization of coal mining wastes Nottingham, England, September 7-11,1987

Available for University of the Philippines System via ScienceDirect. Click here to access
Also available remotely for University of the Philippines System via ScienceDirect. Click here to access thru EZproxy