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                                                                                    Britannica School & Escolar:  http://school.eb.com Britannica E-Stax: http://ebooks.eb.com/texas Gale/Cengage: http://www.galepages.com/j236901  EBSCO eBooks: http://search.ebscohost.com ProQuest SIRS Discoverer: http://discoverer.sirs.com TeachingBooks.net : http://teachingbooks.net/texas