Story highlights Archive had been available only by going to National Archives in Maryland

Documents detail CIA's activities through its history, up through the 1990s

(CNN) The Central Intelligence Agency has published nearly 13 million pages of declassified documents online -- documents that previously were physically accessible only from four computer terminals at the National Archives in College Park, Maryland.

The documents shed some light on the agency's activities throughout the Vietnam, Korean and Cold War conflicts. It even includes documents pertaining to purported UFO sightings and the organization's "Star Gate" program investigating possible psychic abilities and what could be done with them.

"Access to this historically significant collection is no longer limited by geography," said Joseph Lambert, the CIA's information management director in a press release.

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The agency hoped in October 2016 to have the archive publicly available online by the end of 2017, according to a source with knowledge of the agency's effort. The work was labor intensive, but the agency was able to complete this ahead of schedule as a result of significant advancements in technology and data management.

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