por Lutz, Ernst, 1949- [editor] | Binswanger, Hans P [colaborador] | Hazell, Peter Brian Reginald [colaborador] | McCalla, Alexander [colaborador] | Banco Mundial.
por Lutz, Ernst [editor] | Ahmad, Yusuf J [editor] | El Serafy, Salah [editor] | Banco Mundial | United Nation. Environment Programme.