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Sure a fancy numbering system would be nice, but for newer mebers you can add in a page towards the front of the book with a website link written on it that says "for a full siglervese timeline visit www.scottsigler.com/______".  That way you can keep it updated.

or on the binding if you want to get rid of the nuber system you can put one of those square barcodes that you can scan with your smartphone that takes you to a taxonomy diagram like Mr_Fahrenheit's