Yes, I've checked Gutenburg. Not there.
I read them and use Dragon Dictate to transcribe them.
Sure, I could just just scan them, but then I wouldn't be reading and absorbing them for my own edification. Creating the PDF files (after my wife and daughter does serious proof reading) is just one of my purposes. These materials form a part of my own personal study, both doctrinal and devotional.
I read them, and then read them again aloud while transcribing them. I take the time to look up the Scripture references in their contexts and make a lot of notes. I read them yet again while editing them and correcting errors found by my wife and daughter.
Much of the material ends up in my study Bible, and some in my preaching Bible for illustration or reference purposes.