00629nam a2200193Ia 4500 CTU_99277 210402s9999 xx 000 0 und d 305 H276 Hauser, Philip M. Aging of population and labor force for world, more developed and less developed areas and their regions : Population aging 1970 - 2025; labor force aging 1970 - 2000 Philip M. Hauser Tokyo Population research institule 1983 Population Giang Trung tâm Học liệu Trường Đại học Cần Thơ