1
Published 1992
2
Published 1990
3
Published 1982
4
Published 1986
5
Published 1988
6
Published 1984
7
8
Published 1987
9
Published 1993
10
11
by Dunning
Published 1979
12
by Gregory
Published 1979
13
14
by Long
Published 1979
15
Published 1987
16
17
18
Published 1972
19
20
Published 1972