Why are there so few books on the C programming language?

Question

Books

If you look at the pages of online bookstores, you can find only a couple of books on the C language there. It's full on C++, and enough on other younger languages ​​too. And this despite the fact that, according to some ratings, the C language ranks second in popularity, after Java. What is the reason?

Answer 1

All C fits into Kernighan-Ritchie. The rest is libraries and books are written on them separately.
C was the only popular industrial programming language until the late 90s.
It makes no sense to rewrite tons of code from C to C ++, because there is backward compatibility.

Answer 2

I agree with the answers, and by the way, there are quite a few books about C and C ++, no need to troll. In one publishing house "Peter", there are probably several dozen of them.