From 1962–1976, #AynRand published a series of periodicals containing dozens and dozens of nonfiction articles by herself and others. Many were later anthologized, but many more were only available in bound collections from the Ayn Rand Institute.
But now you can get discounted paperback editions from Amazon! https://amazon.com/dp/B0DPJCLFGN?binding=paperback
Here’s an excerpt from the very first article, appropriately titled “Choose Your Issues.” https://NewIdeal.AynRand.org/an-excerpt-from-choose-your-issues-from-ayn-rands-bound-periodicals-now-in-paperback/