As part of its mission to investigate and encourage recovery and recycling technologies, the Bureau of Mines studied the feasibility of recovering metal and nonmetallic mineral values from municipal solid waste. This bulletin reviews Bureau research conducted primarily between 1966 and 1979, which covered various aspects of recycling municipal solid waste and included operation of both a municipal incinerator residue and a raw (unburned) refuse continuous- separation pilot plant. The report describes the products recovered from incinerated and raw refuse and research in upgrading, refining, and/or utilizing the various metal and mineral products. The data are based on approximately 100,000 lb of residues and nearly 1 million lb of raw refuse processed in the pilot plants. Products recovered from incinerator residue included 20 to 30 wt pct ferrous metals, 2 to 3 wt pct nonferrous metals, and 30 to 40 wt pct glass; products from raw refuse included 4 to 8 wt pct ferrous metals, less than 1 wt pct nonferrous metals, 4 to 17 wt pct glass, and 63 to 83 wt pct combustibles. Use of the Bureau's technology at commercial plants in the United States and abroad is briefly described.