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I would give each era a letter
A [olden]
B [modern]
C [crypt]
D [GFL]
I you need to add an era in between C and D, it would be CA
Then give each major book a number divisible by 10 [10, 20, 30...]
Use the 1's space to denote novellas and short stories.
Then place a decimal point, after which you could put series and number in that series. This way you are using the area before the decimal to create a timeline, and the area after the decimal to show a basic description.
D10.GFL1 [The Rookie]
D11 [Title Fight]
D20.GFL2 [The Starter]
D21 [The Reporter]
D30.GFL3 [The All-Pro]


