000 00256nam a2200109Ia 4500
100 _aJames L Lawson
245 _aThreshold Signals
260 _c1950
_aNew York
_bMcgraw Hill Book Compnany
300 _axii+388
700 _aGeorge E Uhlenbeck
942 _cBK
999 _c2848
_d2848