"The National Declassification Center... was established in accordance with Executive Order 13526, by Archivist David S. Ferriero on December 30, 2009. Its mission is to align people, processes, and technologies to advance the declassification and public release of historically valuable permanent records while maintaining national security."
There are many resources that provide access to declassified documents. The following are some of the options.
Some resources such as books and microform sets are available as depository items and purchased collections. Here are some examples. Use the KU online catalog to find other collections and books.