For anyone who thinks they might have missed something, there is a total of eight WORKING location codes.
The unrelated codes (which I did not count) do not work and, in fact, change every time you close the drawer.
This is only for the codes, there is other information in the cataloge that leads somewhere useful.
For an extremely basic example:
Ernst Kreutz Did you mean: 'Kreutz, Ernst'? People are catologed by surnames not first names!