This is one of my most favourite article series and had so many eye openers for me. I also think there is no other resource, neither internet nor elsewhere, that has all this information in one place. I really wished Ian made a book out of it.
The book Linkers and Loaders by John R. Levine is pretty good.
Is there anything in this article series that's not in Linkers And Loaders?
This is much closer to the metal of a modern ELF implementation. Linkers and Loaders is excellent for background and covers a wider spectrum, but was something like a decade old at the time this was written.
I've printed-to-PDF all 20 chapters and have my own book of it now. My only desire is that Ian made a single-page-with-all-chapters view of it available...