There are numerous other books I have yet to obtain.
Regarding the internet, a great resource for dating 78s from the 1940s and 50s is the online Google Books of Billboard magazine.
As late as 1926, Odeon had a series for Austria that had no consistent number on each side there may be much later examples too.
Here is such an Odeon: One can only have ordered it by quoting one side.
Via de rubriek "Accountgegevens" op Lexamore, of via de contactinformatie die is verstrekt in de Algemene Voorwaarden kunt u toegang tot uw gegevens verzoeken, alsmede wijziging of verwijdering daarvan, of bezwaar maken tegen de verwerking daarvan door de Meetic Group.
Alas, I dont have such a list, but the tune which is sung in English was current around the middle of 1926. 2 indicates the Odeon catalogue number, which of course also appears on the label, but with an A- prefix. 3 is interesting: both in the wax and under the label appears a small W in a circle.
The most important number we see in the wax is the same one we see on the label, to the right of the centre hole.
This is the master number, sometimes called the matrix number.
I may, at some point in the future, open this up to be an on-line label gallery for all 78 rpm labels if I decide to spend the time on such a large task.
There are numerous books on the subject of records and record labels. The list below are the references I've used for my site, beyond my own research and some internet searching.