61
by Bawcutt, G. J.
Published 1977
62
Published 1986
63
Published 1985
64
by Xu, Bai Yi
Published 1990
65
by Pohl, Alice N.
Published 1993
66
by Stuart, Peter C.
Published 1989
67
by Pratt, Lorraine Nichols
Published 1985
68
by Anderson, Laura Killen, 1938-
Published 1990
69
by Baugh, L. Sue
Published 1990
70
71
72
73
by Kattan-Ibarra, Juan
Published 1993
74
75
76
Published 1990
77
by Krugman, Paul R.
Published 1988
78
by Brady, Agnes M.
Published 1986
79
by Muckley, Robert L.
Published 1993
80
Published 1990