goofyfoot OP
The only HDCD’s that I’m aware of owning are the Rhino releases of Grateful Dead shows
Here are 368 that were marked HDCD there are thousands, Reference Recordings always use it for their MOR and Classical issues
https://dr.loudness-war.info/album/list?artist=&album=HDCD
More here 560
https://wiki.hydrogenaud.io/index.php?title=List_of_HDCD-encoded_Compact_Discs
And here
https://www.head-fi.org/threads/hdcd-list.65414/
13,000 here!!!!!!!!!!!
https://www.discogs.com/search/?format_exact=HDCD
Cheers George