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Reference.org
National Digital Library Program
open-in-new
<p>The National Digital Library Program (NDLP) is a project by the United States <a href="/facts/Library_of_Congress/TfB6dEN5">Library of Congress</a> to assemble a digital library of reproductions of <a href="/facts/Primary_source/t1l9U3Sm">primary source</a> materials to support the study of the history and culture of the United States. The NDLP brought online 24 million books and documents from the Library of Congress and other research institutions. </p>