There are 8 PalGwe forms. They were created by Kim Soo, who now heads his own style of Cha Yon Ryu.
Mr. Soo did write a book on these forms which I beleive is still sold today.
Actually, I think there were a couple of books covering a few forms each.
They are very similar to the original Shotokan forms that were first used in Tae Kwon Do.
They were taught up through "red belt" or 1st Kup and then the Japanese forms were used for Shodan and up.
I use to know all of them but have not worked them in a long time.
Kim Soo has a school in Houston and has a web site. So finding more information should not be difficult. I think they were created in the late 1960's. But I'm not positive about that.