The National Materials Conservation Symposium on Resource Recovery and Utilization was held 29 April-1 May 1974 at the National Bureau of Standards in The symposium was sponsored by: National Bureau of Standards; Bureau of Mines; Environmental Protection Agency; National Center for Resource Recovery, Inc.; and American Society for Testing and Materials. Harvey Alter, National Center for Resource Recovery, Inc., and Emanuel Horowitz, National Bureau of Standards, served as the symposium cochairmen.