is it a solution to declining and ageing populations? text New York United Nations 2001 monographic viii, 151 p. : ill. ; "ST/ESA/SER.A/206" "United Nations publication sales no. E.01.XIII.19"--T.p. verso. Emigration and immigration Age distribution (Demography) Population Older people JV6225 9211513626 http://www.un.org/esa/population/publications/migration/migration.htm http://www.un.org/esa/population/publications/migration/migration.htm