21
by Poole, Deborah.
Published 1992
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22
by Mallon, Florencia E., 1951-
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23
by Stein, Steve.
Published 1980
Book
25
by Bradley, Peter T., 1943-
Published 2000
Click here for full text
Electronic
26
by Fisher, John R. 1943-
Published 2003
Click here for full text
Electronic
27
28
by Sobrevilla Perea, Natalia.
Published 2011
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Electronic