One of the first efforts in this country to demonstrate solid waste resource recovery technology was the Baltimore Landgard project which was a joint venture between the City of Baltimore, the U.S. Environmental Protection Agency (EPA), the Maryland Environmental Service, and Monsanto EnviroChem. The Baltimore plant was designed and built by Monsanto EnviroChem to thermally process (pyrolyze) 907 Mg (1000 tons) per day of mixed municipal solid waste, convert it to energy (in the form of steam), and recover magnetic metals and glassy aggregate. Although the plant has never been fully operational in its original design configuration, considerable knowledge has been gained from it concerning resource recovery from municipal solid waste. This report is a complete technical, economic, and environmental evaluation of the Landgard Demonstration Plant at Baltimore, Maryland. It presents an introductory problem analysis of most of the major innovations that proved ineffective, caused serious shutdowns, and required redesign or abandonment.