00390cam a22001337a 4500008004000000082001900040100002200059245007700081260004100158300000900199650002200208650001100230650001500241180718b1957   xxu||||| |||| 00| 0 eng d  aB123 C7813 c.2  aCoontz, Sydney H.  aPopulation theories and the economic interpretationcby Sydney H. Coontz  aLondonbRoutledge & Kegan Paulc1957  a199p  aFertility, Human.  aFamily  aPopulation