Topical Subject List With Sub Topics

Hello can anyone tell me if there is a comprehensive standard list of topics with sub topics with classification numbers eg Astronomy 123, sub topic Galaxy's 123.1 (or 123.A or 123a etc.). I know The ATA has a list but doesn't seem to do sub category's

The ATA has things like Mars, Astronauts, Astronomy .. yes - all separate. There remains a Space Topics Study Group - maybe it can help. Details found on main APS website - under Stamp Collecting - Specialty Societies.

https://stamps.org/DisplayPage.aspx?id=219

Thank you did help a bit cant find a subject list though

Perfin_RK, have you tried to Google your request? I tried "Astronomy on stamps" and found a lot of interesting stuff. But maybe you need to be a bit more specific?

Peter

Perfin_RK: Remember that you can always be the solid citizen who builds those sub-lists and uploads them to the ATA.

Cheers,

/s/ ikeyPikey

Thanks all for your input. IkeyPikey am not a member of the ATA, but dont have a problem sharing with anybody. actually would love to share what I have and get help in return, was thinking of making my own list with the ATA numbering system as a starting point, but I suppose ill need to speak to them first and see what they have to say or have any suggestions. I have googled extensivly but have found no comrehensive list as yet. I have started one but maybe if someone else is interested we could help each other.