601
Published 1994
602
603
604
605
Published 1988
606
607
by De Bono, Edward, 1933-
Published 1971
608
609
by Newbold, Paul.
Published 1991
610
by Fuller, Floyd
Published 1994
611
by Patel, S. K.
Published 1994
612
by Lister, Ted
Published 1995
613
by Elliott, John Huxtable.
Published 1968
614
by Web, Ken
Published 1990
615
by Fitzpatrick, J.B.
Published 1992
616
by Needham, Dave
Published 1991
617
by Mahathir bin Mohamad, 1925-
Published 1986
618
by Parkin, Michael.
Published 1990
619
by Newton, T. J.
Published 1990
620