000			00496pam a2200169a 44500
008			170807b1994 xxu||||| |||| 00| 0 eng d
020			_a
082			_aNBER TWP157
100			_aHeckman, JJ
245			_aEconometric Mixture Models And More General Models For Unobservables In Duration Analysis
260			_aCambridge, MA _bNBER _c1994
300			_a34p
490			_aTechinical Working Paper Series
700			_aNational Bureau Of Economic Research
906			_a16300
942			_2ddc _cG
999			_c124040 _d124040