Question for you Vinyl1: was every mono version (LM) Shaded Dog also produced in LSC stereo? If not, do you know what the criteria was to produce the stereo versions after issuing the mono?
The early LPs in the LSC-18XX and LSC-19XX series were recorded quite early, long before the stereo record was developed. RCA started recording selected performances in stereo in 1954. The first use they made of these recordings was to issue two-track stereo tapes. These tapes were sold in tiny quantities to wealthy hobbyists - I believe they cost $25 in 1956, so you can just imagine how few were sold.
Of course, all these performances were issued in mono as they were recorded. LM-1806 and LM-1817 came out in 1954, along with all the numbers in between.
RCA's purpose in doing this was their belief that eventually stereo records would be sold, and they wanted to have a backlog of exciting stereo material that they could issue immediately. They also wanted to get experience with stereo technology, and figure out the best way of recording and mixing stereo so that they would be ready to sell to the mass market.
So when the industry agreed on a standard for stereo records in 1958, they were ready to go. They were able to issue their very first batch of stereo LPs for Christmas 1958, although availability was spotty until mid-1959.
As I said, they only recorded selected performances in stereo during the 1954-9 period. It was very expensive, and they picked sessions that they thought would sell in stereo. Nearly all of these tapes were issued on early LSC records, although a few were not. The most famous of these is the Berlioz Symphonie Fantastique with Munch, and the Reiner Heldenleben. Either they weren't satisfied with the quality of the tape, or they didn't think it would sell.
Meanwhile, of course, the mono division rolled along. Nearly every number in the LM series was issued as it was recorded throughout the 50s. When the stereo record came out, they started doing more sessions in stereo, but the mono-only session lasted well into the 60s.
An interesting byproduct of this strategy was that the earliest recordings were very short-lived. RCA decided to re-record the Reiner Zarathrustra, the Fiedler Gaite Parisienne, and the Munch Daphnis and Chloe in the early 60s. Consequently, the great early recordings were deleted from the catalog after only a tiny number had been sold. Needless to say, the new recordings were NOT as good as the original 1954 material.