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There is an open-source textbook on stacks being created. You can find it http://www.math.columbia.edu/~dejong/algebraic_geometry/stacks-git/here

It's already more then 1400 pages long!
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There is an open-source textbook on stacks being created. You can find it http://www.math.columbia.edu/~dejong/algebraic_geometry/stacks-git/

It's already more then 1400 pages long!