Why so few 15C/11C application and program books?

[Geoff Quickfall]

I have this in my library, granted not a compendium of routines but very helpful.

HP book at Amazon (check the price )

As noted in the above posts, the nice thing about the 15C is that any other keystroke rpn HP machine up to the 15C pretty much do a direct translation.

Minor differences would be the ability to STO X - / + commands versus the machines without that ability.

P.S. this is not my sale!