Stephen Emond has kindly released a sample of the contents of his recently published book, Ultima: The Ultimate Collector’s Guide. In keeping with the release history of the Ultima series itself, he has chosen to allow the Ultima 4 section of his document to be released in full, for free:
This section gives a very good idea of just how comprehensive the guide is, as it steps through over forty different release versions of Ultima 4 across numerous platforms, examining in detail both the unique items that were included with each, as well as the subtle variations in things like maps and manuals that existed between versions and systems.
You can download the fifty (50)-page document above, or read through it here:
