I was on the fence about where to post this. There are some bona fide
books, of interest to Christians, among these. But, there are also a lot of
charts and
small booklets, too, which would normally go on the Media thread.
Anyway, I think that this may have been mentioned before but, if so, it's been a while. Answers in Genesis, the apologetics website, offers some
free downloads. It looks like there are about 2 -3 dozen at the present time.
I think that
this link might work for you to see what's available. However, if it doesn't, you probably will need to set up an account or log in to one that you already have in order to access
that webpage or some other one which lists the downloads that are available.
Annoyingly, these downloads, as far as I can tell skimming through the list, require several different, particular devices, readers, etc. in order to be able to open them. A few require the Answers in Genesis mobile application (I didn't even know that they had one--that's all that we need is one more proprietary ebook app.

). If you do not have that particular app, which is the most likely scenario for you, I feel sure that Answers in Genesis offers it for free somewhere on
their website.
If you haven't checked into Answers in Genesis'
free downloads in a while, why not give them a look-see?