00328nam a22000977a 4500999001900000020001500019245003400034260004500068942000700113952011000120  c258993d258992  a0153663502  aEnergy, its forms and changes  aNew YorkbHarcourt, Brace & World c1972  cBK  001040708NFICa40404b40404cGENd2020-08-11l0oQC73 .B67 1972p201610376r2020-08-11w2020-08-11yBK