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2. National Academy of Sciences. Resource Recovery from Municipal Solid Wastes Washington D. C. 1975.
3. Quimby T. H. E. Recycling: The Alternative to Disposal Johns Hopkins University Press Baltimore Md. 1975.
4. Landfill methane recovery shows promise, but projections may be too optimistic;Dair F. R;Solid Waste Systems,1976
5. Public Waste Management;Fairbanks J.;Inc.,1976