Each of these selections is of an introductory character, and there is no actual philosophy in the first two, since those particular chapters are brief and biographical in nature. The more difficult and meaty material comes later in each book. But for what it’s worth, there they are. Nothing from The Last Superstition or On Nozick is available online, I’m afraid.
(That’s the actual cover to On Nozick up above, by the way, contrary to what the Amazon page would lead you to think. Note also that though the book got five friendly print reviews and no hostile ones, the one yutz who reviewed it at Amazon gave it two stars and claimed that it needed “more Nozick and less Feser.” Maybe that explains the sales figures. What the reader is actually complaining about is the fact that I devoted space to situating Nozick within the larger libertarian tradition of thought of which he was a part rather than treating him as an idiosyncratic and isolated freak, as is so often done. Sue me. Anyway, that particular book – which was finished in 2002, just before I began a serious rethink of libertarianism – has a fair amount of stuff in it that I no longer agree with. Still very useful if you want to understand Nozick, I like to think, but maybe someday I’ll write a nasty review of it myself.)