Migration the demographic aspects.

Manylion Llyfryddiaeth
Awdur Corfforaethol:	Organisation for Economic Co-operation and Development
Fformat:	Llyfr
Iaith:	English
Cyhoeddwyd:	Paris, France OECD 1991.
Cyfres:	Demographic change and public policy.
Pynciau:	Population geography. Population.