00399nam a2200109Ia 4500082002100000100001600021245019000037260003500227300001700262500000500279700000500284  a338.012bB724.EC  aBoon, G. K.  aEconomic choice of human and physical factors in production; an attempt to measure the micro-economic and macro-economic possibilities of variation in factor proportions of productionb  aAmsterdambNorth-Hollandc1964  axviii, 332p.  a  a