00498cam a2200145 a 4500020001500000050001500015245007900030260003900109300002600148490002500174500008000199500002400279650001500303650003400318  a921151359600aHB871 200100aWorld population monitoring 2001 :bpopulation,environment and development  aNew York :bUnited Nations,c1992.  axii, 241 p. :bill. ;1 aPopulation studies ;  aAt head of title: Department of International Ecoonomic and Social Affairs.  a"ST/ESA/SER.A/126." 0aPopulation 0aAge distribution (Demography)