Credit to reddit user theyarehere47.

These are just copies of documents sent by UFO researcher Lee Graham, who was trying to validate their authenticity.

The fact that they are on file at the Reagan library does not mean they are authentic, they are there because they were documents received during Reagan's presidency.

The document the quoted regarding "Project Aquarius" is known as "The Carter Briefing Notes" or "The Carter Document" and came out back in the late 1980's.

Then-UFOlogist Bill Moore (co-author of the first book on Roswell) had been in contact with a number of intelligence sources and one day they sent him on crazy trip straight out of an espionage movie. He had to engage in all sorts of cloak and dagger tradecraft, like flying across the country, waiting for instructions by pay phones, etc--- finally, he ended up in a motel in upstate New York.

There was a knock on the door, and when Moore opened it, a man was standing there holding an envelope. The man told Moore he had precisely 19 minutes to do what he wanted with the documents.

So Moore clicked on the light at the desk, and began photographing the papers. He also read the text into a tape recorder, in case the photos didn't come out. Precisely 19 minutes later, the man collected the papers, put them back in the envelope, and left without saying a word.

Sometime later, Moore published the document as part of his investigation into the original MJ-12 documents. Although he never came to a final conclusion, he suspected it probably was a mix of disinformation and truth.