621
622
Published 1991
623
by Brennan, Brian
Published 1992
624
by Warner, Bill
Published 1989
625
by Berenson, Mark L.
Published 1990
626
by Hahn, Liang-shin.
Published 1994
627
by Foster, John
Published 1992
628
Published 1996
629
by Rothnie, Niall
Published 1991
630
631
632
by Ceighton, Breen
Published 1990
633
by O'Dwyer,John J.
Published 1984
634
by Dziewanowski, M. K.
Published 1979
635
by Spence,Jonathan D.
Published 1990
636
Published 1992
637
by Roberts,Wayne A.
Published 1982
638
639
640
by Bednell, Schiffman
Published 1997