E-books can be located at a variety of online sources:

• Textbooks: Almost every textbook publisher now offers at least some of textbooks online or on CD. Ask the company's local sales rep or search Google for the home page of your textbook's publisher. Even if the entire textbook is not available in digital format, often such materials as interactive quizzes, activities, and related Web sites are available free -- sometimes even to those who haven't purchased that company's textbook.
  
  
• Copyright-free e-books: Project Gutenberg is one of the largest and oldest e-book libraries, with more than 6,000 e-books available for free downloading. The University of Virginia's Electronic Text Center makes more than 1,200 free texts available to those using Microsoft Reader. A more eclectic collection of free e-books, including many recent nonfiction selections, is available at Free eBooks.
  
  
• Copyrighted e-books: A simple search at Yahoo or Google for "e-books" or "e-texts," or for the title of a specific book can help locate more recent e-books. Although many of those will have to be purchased, contacting a book's author or publisher to request permission to use an online version in your classroom is always worthwhile.

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