Here are some other websites that you should explore when researching for your Spanish classes:
Iberian Studies Web
Webliography maintained by the Association of College and Research Libraries
Biblioteca Nacional de España
Spain's national library
Hemeroteca Digital (España)
Digitized periodicals from Spain and the Americas from 1683-2009.
Primeros Libros de las Américas
Digital collection of the first books printed in Mexico before 1601
Hispanic Reading Room at the Library of Congress
Project Gutenberg (Spanish)
Digitized books in Spanish that are in the public domain (pre 1923)
Digitized Cuban radionovelas (from Tulane)