The 1993 Information please environmental almanac

Manylion Llyfryddiaeth
Awdur Corfforaethol:	World Resources Institute
Fformat:	Llyfr
Iaith:	English
Cyhoeddwyd:	Boston Houghton Mifflin Co. 1993. ©1992.
Pynciau:	Environmental protection. Human ecology. Ecology. Conservation of natural resources.