000			00386nam a2200169 4500
020			_a _c
082			_a500 HEA
100			_aHEARD GERALD
245			_aSCIENCE FRONT 1936 _hENGLISH
250			_a
260			_aNew York _bCassell _c1937
300			_a122 _fHB
500			_a
590			_d
650			_aSCIENCE FRONT 1936
942			_cBK
999			_c274753 _d274753