A project to find and digitize all documents written by or to President Abraham Lincoln has been awarded a $400,000 grant from the National Endowment for the Humanities.

The Abraham Lincoln Presidential Library and Museum said in a news release Monday that the grant will allow more documents from Lincoln's career in Congress to be posted online. Lincoln served one term in the U.S. House from 1847 to 1849.

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The release says the three-year grant is the largest that the project, called the Papers of Abraham Lincoln, has received from the National Endowment for the Humanities. Matching funds make up $300,000 of the grant, and the project must raise $100,000 per year from private sources to match the offer.

Project editor and director Daniel Stowell said in the release that the grant "validates the progress" made so far.