What comes after the Basics?

In reading a chapter in Scientology 0-8, I came upon the Tone Plotting Scale from a June 1955 lecture by L. Ron Hubbard.  Looking this up on the Materials Guide Chart, I saw that this was from the Anatomy of the Spirit of Man Congress which LRH held at that time.   However, I quickly also saw that there are a number of other unreleased items that look like they will much further explain some of the concepts I’m reading on the Basics.  Can’t wait for these to come out!!