00341nam a2200121Ia 4500008004100000040001500041041001200056082001700068100002700085245005200112260004000164300001500204230917s9999||||xx |||||||||||||| ||und||  e4046aMAIN  aEnglish  a309.154 A53B  aAllen, Frederick Lewis 0aBig change: America transforms itself 1900-1950  aNew YorkbHarper and Brothersc1952  axi, 308 p.