Admittedly it's not within the U. S. of A., but the combined Regent College - Carey Theological College library in Vancouver, BC is very good. Given that it is a branch of the Evangelical Library in London, I can get just about anything I need from it.

And let's not forget that any library that is linked to Early English Books Online has online access to just about every Puritan publication that ever was. Your local University library should have this access.

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In Christ's love and service

Mr. Tim Cunningham, Dip. CS (Regent College)
Member, First Baptist Church
Vancouver, BC

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"The Reformation was a time when men went blind, staggering drunk because they had discovered, in the dusty basement of late medievalism, a whole cellar of 1500-year-old, 200 proof grace—a bottle after bottle of pure distillate of Scripture, one sip of which would convince anyone that God saves us single-handedly. The word of the gospel—after all these centuries of trying to lift yourself into heaven by worrying about the perfection of your own bootstraps—suddenly turned out to be a flat announcement that the saved were home-free before they started. Grace was to be drunk neat: no water, no ice, and certainly no ginger ale." – Robert Farrar Capon