This USGS Circular, "Materials and Energy Flows in the Earth Science Century -- A Summary of a Workshop Held by the USGS in November 1998," takes a "thorough and holistic view of the materials flow cycle, wherein materials are tracked throughout their life cycle from extraction, through manufacturing, consumer use, reuse, recycling, and disposition." The circular ends with selected references and appendixes including a list of speakers and participants and their contact information.