Why in the world do people buy Kanitkar's books? :S
Beginner:
1. C Primer Plus - Stephen Prata
2. A Book on C - Al Kelley, Ira Pohl
3. C Programming: A Modern Approach - K.N. King
4. Programming in C - Stephen Kochan
Intermediate:
1. The C Programming Language - K&R
2. The Standard C Library - P.J. Plauger
3. Expert C Programming - Peter van der Linden
4. C Traps & Pitfalls - Andrew Koenig
5. C: A Reference Manual - Harbison & Steele
6. The C Puzzle Book - Alan Feuer
7. C Programming FAQs - Steve Summit
8. Pointers on C - Kenneth Reek
Advanced:
1. C Interfaces and Implementations - Hanson
2. C Unleashed - Richard Heathfield et al
I can personally vouch for the quality and contents of the books aforementioned, except for King's and Hanson's. And the remaining two are highly recommended by the experts.
Apart from these books, you'll have to through numerous others that use C for algorithms (eg. Sedgewick), data structures, network and systems programming.