The power of convening : collaborative policy forums for sustainable development : proceedings of an international workshop held at Claremont, California, October 5-7, 1987 1990
World directory of environmental organizations : a handbook of national and international organizations and programs (government and non-governmental) concerned with protecting the earth's resources 1992
World directory of environmental organizations : a handbook of national and international organizations and programs-government and non-governmental-concerned with protecting the earth's resources 1989
