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Why not add a page to the back or front of each book. This could be as complex or simple as you like...it this page would basically detail the different "eras", and then would list in order the different works. You could even make this almost like a family tree. I have seen authors do this with character trees that are out of control, so you can instantly see who that character is and what book you've seen then in before. So...for example, let's go with Infected, this page could look something like.
Old Era
work 1
work 2
work 39
Modern era
work x
work y
Infected
work z
work b
You see the idea, but then this presents the problem of...well how to we have a completed tree on older books. Easily, you don't. You add the books that are currently printed, then if something new comes out you update that book's Siglerverse tree and all books that come after it. Obviously this is not a perfect system either, but it eliminates the problem of cumbersome numbers down the line.


