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 /
Trzyna, Thaddeus C.,1939-
Gotelli, Ilze M.
California Institute of Public Affairs.
Sierra Club.
International Union for Conservation of Nature and Natural Resources.
Claremont, Calif. : California Institute of Public Affairs in cooperation with the Sierra Club and IUCN - the World Conservation Union,
c1989.
Conservation of natural resources
Environmental protection