•In above report, the total UFO sightings are recorded between 1947 and 1965
however in the official FBI bluebook FOIA the total UFO sightings date between 1947 and 1969
There are some inconsistencies between both documents [possibly] due to the source of reference (case files vs. bluebook)
The Bluebook overview on Above Top Secret:
From 1947 until 17 December 1969, the United States Air Force actively investigated reports and sightings of unidentified flying objects - UFOs, under a program called Project Blue Book. The project which was headquartered at Wright-Patterson AFB, was terminated in December of 1969 after 22 years. US Air Force Secretary Robert C. Seamans, Jr., terminated the project because the US Air Force could no longer justify the project for national security reasons or scientific study. After closing Project Blue Book the US Air Force has not publicly acknowledged any further interest in UFO sightings....
This project is very complex and needs an enormous time to study. There are points made that Project Bluebook coverd up the real UFO investigation...
Project Blue Book, it seems, was just a low level collection and disinformation program created under Project Sign (of December 1947) which evolved into Project Grudge (of December 1948) to cover up the true investigation into the alien presence on Earth.
For a more comprehensive overview of the Project Bluebook: Wikipedia

