1
2
Published 1971
3
Published 1986
4
by Seeley, Ivor H.
Published 1965
5
by Khanna, P. N.
Published 1981
6
by Urquhart, Leonard Church
Published 1959
7
8
9
Published 1962
10
Published 1954
11
Published 1976
12
Published 1988
13
14
15
by Hennes, Robert G.
Published 1969
16
17
by Barry, Austin B.
Published 1988
18
19
by Bauer, Kurt W.
Published 2010
20
by Probst, Emil Heinrich
Published 1961