00255nam a2200109Ia 4500082002000000100001900020245003800039260004200077300001600119500000500135700000500140  a304.65bH332.PQ  aHartley, S. F.  aPopulation quantity vs. qualityb  aEnglewood CliffsbPrentice-Hallc1972  aviii, 343p.  a  a