-
1961
-
1962
-
1963
-
1964
Ol' Man River designing the eco-management of the Hawkesbury-Nepean environment
Cyhoeddwyd yn Asian Review of Public Administration (1992)Erthygl -
1965
-
1966
-
1967
-
1968
-
1969
-
1970
The Philippine natural resources accounting project (NRAP- PHASE I) main report.
Cyhoeddwyd 1992Llyfr


