00313nam a2200121Ia 4500008004100000041000800041084001000049100001400059245004900073260003800122653001400160653001700174160808s1951    xx            000 0 eng d  aeng  aX2CC  aZweig, F.  aProductivity and trade unions /cby F. Zweig  aOxford :bBasil Blackwell,c1951.  aEconomics  aProductivity