World Resources 1990-91. A report by the World Resources Institute in collaboration with UNEPand UNDP.

Manylion Llyfryddiaeth
Awduron Corfforaethol:	The World Resources Institute, The United Nations Environment Programme, The United Nations Development Programme
Fformat:	Llyfr
Iaith:	English
Cyhoeddwyd:	New York, New York Oxford University Press 1990
Pynciau:	Statistics. Resource management. World resources data tables. Condition and trends. Climate change.