Extremal Finite Set Book Recommendation I want to read Extremal Finite Set Combinatorics in some detail.
(By 'Extremal Finite Set Combinatorics' I mean the subject which covers theorems like Sperner's Theorem, Erdos-Ko-Rado Theorem, deBruijn-Erdos Theorem etc.)
Can somebody please recommend me a good book for self-study for this purpose?
Thanks.

I would recommend Ian Anderson's book: Combinatorics of Finite Sets.
It is very readable and gives a good introduction.
Another good choice is Bollobas's book: Combinatorics: Set Systems, Hypergraphs, Families of Vectors and Combinatorial Probability.
Also readable.  A bit more emphasis on probabilistic ideas. 
There is also a couple chapters of an unfinished book here 
http://www.renyi.hu/~ohkatona/
For linear algebraic techniques there is a great preliminary manuscript which is linked to here due to Frankl and Babai:
https://mathoverflow.net/questions/17006/linear-algebra-proofs-in-combinatorics
One more nice introduction in a broader setting is the notes of this BSM class, they are available somewhere online I think but I can't find them at the moment:
http://www.bsmath.hu/11spring/com2a_11s.html
