00470nam a2200169Ia 4500082001900000100002400019245003900043260005400082300001000136500000500146690000600151700000500157952010000162964001700262921000800279999001300287  a303.4bW363.MH  aWeaver, Henry Grady  aThe mainspring of human progressb  aNew YorkbFoundation for Economic Educationc1962  a279p.  a  a   a  00104070aISIbISId1998-06-02l0o303.4 W363.MHpDP7477r2019-02-14 00:00:00w2019-02-14yBK  abcdefg  a934  c934d934