The authors' filing was lodged in federal court in the Southern District of New York last month, but was only made public on Friday. In the filing, the Authors Guild, whose president is novelist-lawyer Scott Thurow, urged the court to rule that Google's digitization project does not constitute "fair use" under copyright law.
A Google spokeswoman said in an emailed statement: "We believe Google Books constitutes fair use by allowing users to identify interesting books and find ways to borrow or buy those books, much like a card catalog for the digital age."
Litigation over Google's digitization project began seven years ago after Google began copying millions of books thanks to an agreement with libraries, including those at Harvard University, Oxford University and Stanford University.
Google has said it has scanned more than 20 million books since the agreement was made in 2004.
In March 2011, a federal judge rejected a $125 million settlement in the case. In May, the authors were granted class action status.
Copyright Thomson Reuters 2012