00501nam a2200169Ia 4500082002300000100003600023245004700059260004900106300001500155500000500170690000600175700000500181952010400186964001700290921000900307999001500316  a338.01(73)bK33.PT  aKendrick, J. W. and Pech, M. R.  aProductivity trends in the United Statesb  aNew JerseybPrinceton University Pressc1961  alii, 630p.  a  a   a  00104070aISIbISId1998-09-09l0o338.01(73) K33.PTpDP2410r2019-02-14 00:00:00w2019-02-14yBK  abcdefg  a9793  c9793d9793