World directory of environmental organizations : a handbook of national and international organizations and programs - governmental and non-governmental concerned with protecting the earth's resources / edited by Thaddeus C. Trzyna, elizabeth Margold...

1st ed. published 1973 by the Sierra Club, San Francisco; 2nd ed. published 1976 by Public Affairs Clearinghouse...; 3rd (1989), 4th (1992), and 5th (1996) eds. published by the California Institute of Public Affairs