1
Book
2
by Pearce, Susan M.
Published 1993
Book
7
by Ridley, Michael
Published 1970
Book
8
Published 2008
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Electronic Journal
9
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Electronic Journal
13
Published 2010
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Electronic Journal
14
Published 1971
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Electronic Journal
18
by Fleischman, Paul.
Published 2013
Book
19
by Frank, Jeanne
Published 1997
Book