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

Xehetasun bibliografikoak
Egile korporatiboa:	The World Resources Institute, The United Nations Environment Programme, The United Nations Development Programme
Formatua:	Liburua
Hizkuntza:	English
Argitaratua:	New York, New York Oxford University Press 1990
Gaiak:	Statistics. Resource management. World resources data tables. Condition and trends. Climate change.