Unless otherwise indicated, this data is taken from The League of Women Voters // The Garbage Primer. — New York: Lyons & Burford, 1993. — С. 35–72. — ISBN 978-1-55821-250-3., which attributes, «Garbage Solutions: A Public Officials Guide to Recycling and Alternative Solid Waste Management Technologies, as cited in Energy Savings from Recycling, January/February 1989; and Worldwatch 76 Mining Urban Wastes: The Potential for Recycling, Апрель 1987.»
