That's an interesting case, but it's far from representative of the system as a whole. The best you can do in that situation is use that information to criticize that specific school district, but you can't extrapolate that to a systemic critique.
http://scholar.google.com/scholar?q=unequal+funding+educatio...
A good "primer" book, although a bit old, but not outdated, is called "Savage Inequalities"
http://www.amazon.com/Savage-Inequalities-Children-Americas-... http://en.wikipedia.org/wiki/Savage_Inequalities
Another book is "The Shame Of A Nation" by the same author. These are just starting points, though, there's no shortage of studies, essays, books, and scholarly works on the subject. What I'm presenting here, in terms of social critiques of education, is by no means unique.