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I hope I am not under thinking this situation. I like the K.I.S.S. method for any problem. Here is what I see as a simple solution.
First, ignore the whole flashback concern...If a junkie can't figure that it is a flashback they are not worthy...they should be killed...and eaten.
Here is my simple combination of what I have read from others.
1. Have at the top the ERA like you have in the GFL Series books
2. At the bottom you can put the main year that the story is centered...example 2012
3. On one of the first pages of the book have an up to date list of products from that ERA in order of the date timeline when it is set to start (flashback start not included)...example
Infected (Novel) 1/1
Infected (Graphic Novel) 1/1
Scary Perry: Home Invasion (PC Game) 5/8
Presidential Files: The Blue Triangles Book 1 (Novella) 7/1
Contagious (Novel) 1/1
Presidential Files: The Blue Triangles Book 2 (Novella) 7/1
Ancestor (Novel) 1/5
Nocternal (Novel) 3/1
4. At the end put in a listing for the link to your website and to the timeline located on the website for additional books they may want to read.
This would give them the list of books in that era and in what order to read them...a location to look up the timeline and other timelines in case the book they found is old. If we as followers of the FDO can't figure out that maybe this novella or that novel land in the timeline of another we should be...well...found unworthy...killed...and eaten!
I'm just saying...