| Author's List |
| title | creator | language | description | tableOfContents | contributor | subject | created |
| The Report on Unidentified Flying Objects | Ruppelt, Edward J., 1922-1960 | en | 2005-12-18 | ||||
| USAF Fact Sheet 95-03 Unidentified Flying Objects and Air Force Project Blue Book | United States. Air Force | en | Project Blue Book (U.S.); Unidentified flying objects | 2008-06-01 |