Hey Gazza!
First let me say the comics categories are rather impressive as is! :-)
-BUT- can use some improvements.
For comics there are definite 'core' books that should be there. I have hundreds to list so there will be a need for them.
For each Age of US comics - Silver Age, Bronze Age, Copper Age, and Modern Age - There should absolutely be under category DC:
Justice League of America (JSA)
Justice Society of America (JLA)
these core titles have volumes than run through each of these Ages.
THANK YOU :-)
-Jay