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Scott_MacAlliston said: Seriously Scott,
putting more stuff on the Cover of a Book is a safe way to get potential buyers confused. I am a bookseller for 8 years now, and have seen it happen many times, too many times...
I side with Mr. Fahrenheit. Come up with 4 Icons, each for every Era and put that Icon/Logo on the Spine of the Books.
Then add a Timeline in the Front or the Back of a Book. The Expanded Universe Timeline of StarWars is very, very good and quite easy to decipher.

And u can include the newest timeline with every reprint of the current edition.
That way you can avoid the problem, with a non up to date timeline in older books.

Hope that helps.

Cheers from good old Germany.
(Sorry for my english, its quite early over here ;-))