00392nam a2200133Ia 450000100060000000300050000600500170001100800410002810000310006924500550010026000730015530000110022865000190023926877BIBL20200228021700.0911219|1953||||nyu|||||||||||00010|eng|d10aWeaver, Henry Grady2Local14aThe mainspring of human progresscby Henry Weaver.0 aIrvington-on- Hudson, N.Y.bFoundation for economic Educationc1953.  a279 p. 0aLiberty2Local