Now that executives at Fox are in talks to bring back ‘The X-Files,’ it looks like Agent Mulder may have an easier time obtaining information on UFO investigations performed by the US Air Force. Project Blue Book is now available as a PDF online with easy browsing via year and keyword.

During the 1950s and 1960s, the US Air Force analyzed over 10,000 UFO sightings to determine if these unidentified flying objects were a threat to the United States. Project Blue Book’s predecessors, Project Sign and Project Grudge, began investigating UFO sightings in the late 1940s.

Based out of the Wight-Patterson Air Force Base in Ohio, Project Blue Book has over 130,000 pages filled with accounts of unusual sightings between the years 1947 and 1969. While the sightings were attributed to flight tests of reconnaissance aircrafts, weather conditions, or even smudges on film, 701 incidents still are considered unidentified.

Oddly enough, Project Blue Book doesn’t contain any information about the 1947 Roswell UFO incident, which certainly makes you wonder if the government is still covering up this so-called weather balloon crash. However, there are other UFO sightings from Roswell, New Mexico in the files.

Project Blue Book ended in 1969 after an evaluation by the University of Colorado in their report, “Scientific Study of Unidentified Flying Objects., The US government concluded (or at least told the American public) that “no UFO reported, investigated and evaluated by the Air Force has ever given any indication of threat to our national security (and) there has been no evidence indicating that sightings categorized as ‘unidentified’ are extraterrestrial vehicles.”

Project Blue Book has been available online and on microfilm in Washington, but this marks the first time the studies have been available in an easy searchable format. Compiled and converted by UFO enthusiast John Greenewald, his website The Black Vault also includes sightings analyzed in Project Sign and Project Grudge. Greenwald spent almost 20 years filing Freedom of Information Act requests to obtain the information.

You can check out Project Blue Book here.

Sources: USA Today; io9