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So here's my idea:

The Four Eras would each have a logo, and for the example:

So further immediate visual categorization can be achieved by giving each Main book in a series its own color for the logo logo. Then any Novella taking place after one of those books can be a varying shade of the color used for the Main Book.

The Rookie = Dark Blue

Title Fight = a Lighter Blue

The Starter = Dark Purple

The All-Pro = Dark Green

The Reporter = Lighter Green than the All-Pro

The Detective = Lighter Green than the Reporter

Etc.

For those of us who want it layed out logically on a page: 

Still use some kind of logo so that 1 mark can be used for each era. Then further classify by Numerically ordering the Series and stand alone Novels that will be in each era, and then another decimal place for the number which that book is in its own series.

The Novellas then get theyre own decimal point. For the numerical order which it takes place after the starting of it main Novel.

So there is the problems of Pandemic and Descendant and the Nocturnal Sequel, because they will not be directly after their previous book chronologically. So when listing them off leave them in the order that they happen and still being able to tell which one is part of which series.

Stand alone short stories could even be listed by leaving the first two places as a 0.

For this Example:

+.1.1.0=GFL Era.GFL Series. The Rookie

+.1.1.1=GFL Era.GFL Series. The Rookie. Title Fight

+.1.2.0=GFL Era.GFL Series. The Starter

+.1.3.0=GFL Era.GFL Series. The All-Pro

+.1.3.1=GFL Era.GFL Series. The All-Pro. The Detective

+.1.3.2=GFL Era.GFL Series. The All-Pro. The Reporter

+.1.4.0=GFL Era.GFL Series. The MVP

@.1.1.0=Crypt Era.The Crypt. The Crew

@.1.2.0=Crypt Era.The Crypt. Shakedown

&.1.1.0=Modern Era.Infected Series. Infected

&.1.2.0=Modern Era.Infected Series. Contagious

&.2.1.0=Modern Era.Ancestor Series. Ancestor

&.3.1.0=Modern Era.Nocturnal Series. Nocturnal-------(all after this are hypothetical in their release order)

&.1.3.0=Modern Era.Infected Series. Pandemic

&.4.1.0=Modern Era.Earthcore Series. Earthcore

&.3.2.0=Modern Era.Nocturnal Series. Nocturnal Book 2

&.2.2.0=Modern Era.Ancestor Series. Descendant

&.4.2.0=Modern Era.Earthcore Series. Mt. Fitzroy

&.0.0.1=Modern Era.Stand Alone Short/Novella. Hero