Google is making its vast online library of books available for mobile phones.

The Internet search giant, in a post on Thursday on the Google Book Search blog, said mobile versions of the books could be read on devices such as the Apple iPhone or T-Mobile G1, which is powered by Google's Android software.

"These new mobile editions are optimized to be read on a small screen," Google said. "With this launch, we believe that we've taken an important step toward more universal access to books."

To access the mobile version of Google Book Search a user needs to type http://books.google.com/m into the Web browser of their iPhone or Android phone.

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