"Building Blocks of the Universe" is an article/talk by Cleon Skousen, who was an influential Latter-day Saint speaker in the 1980s and 1990s (though not a general authority). As far as I know, it has never been published or endorsed by the Church. I looked it up on Google and reading through it, it might be interesting to some, but it gets into doctrinal speculation a little more than I'm comfortable with. (This is just my personal opinion.)
There are a lot of materials in the Gospel Library app, including general conference talks and magazine articles going back a few decades, that provide a lot of potential reading material.
Samuel Bradshaw • If you desire to serve God, you are called to the work.