Apple Shows Off New Products at Exposition Lawrence J. Magid, Lawrence J. Magid is chairman of Know How, a San Francisco-based microcomputer education company. and The Computer File welcomes readers' comments but regrets that the
authors cannot respond individually to letters. Write to Lawrence J. Magid, 4 Embarcadero Center, Suite 1970, San Francisco, Calif. 94111
Blame Joblessness, More Than Family, for Black Poverty GREG J. DUNCAN, Greg J. Duncan is a program director at the Survey Research Center, University of Michigan. He is co-director of the Panel Study of Income Dynamics and author of the book, "Years of Poverty, Years of Plenty" (Institute for Social Research, Ann Arbor).