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21
by Barrett M. A.
Published 1974
Book
22
Published 1977
Book
23
by Williamson G.
Published 1959
Book
24
Published 1972
Book
25
26
Published 2006
Book
27
Video
28
by Van Emden, Helmut Fritz.
Published 2004
Book
29
by Newsome, David.
Published 2005
Book
30
by Maathai, Wangari.
Published 2006
Book
31
Published 2009
Book
32
33
34
35
by Napoli, Donna Jo.
Published 2010
Book
36
Published 2009
Book
37
by Gustafson, A.F.
Published 1997
Book
38
by Hoban, Brom.
Published 1980
Book
39
by Lorenz, Oscar A.
Published 1988
Book
40
by Gupta, O.P.
Published 1998
Book