SC ? (Puccini)

[JeanneMarie]

Puccini's operas are followed by an SC number. Anybody know what this stands for? I really have tried searching but I'm coming up empty handed.
Many thanks.

[Choralia]

I guess it's a short for Schickling Catalogue, being Dieter Schickling the author of "Giacomo Puccini. Catalogue of the Works" published by Bärenreiter:

https://www.baerenreiter.com/en/shop/pr ... s/BVK1582/

Max