Which manual for HP-48SX?

[Kaliuzhkin]

I'm in the market for an HP-48 calculator. In the 1990's, I had, what I think was an HP-48G and loved it. I'm looking on eBay and the choices seems to be HP-48SX, HP-48S, HP-48G, HP-48G+ and HP-48GX. I have an HP-48gii and don't like it as much as the others. I'm inclined towards getting an HP-SX.

Two manuals are associated with the SX on eBay. They are the HP-48SX Owner's manual, volumes I and II, and the HP-48 Owner's manual. The HP-48SX Owner's manual volume II, and the HP-48 Owner's manual are hard to find and expensive. Which of these, or another, would be appropriate? I know the HP-48SX Owner's Manual, both volumes, are available herein on the Museum Document Set, but I like paper manuals. Also, is any other material available for free download?

I figure that the HP-48 Owner's manual was meant to apply to the HP-48SX when it first came out, because that was the only HP-48 model then.

FWIW, I also have an HP-35 and 35s. The former is my favorite calculator. I'm happy to say I got an HP-35 (not the same one) for my job as Scientific Programmer in 1972.