I'd second Roy's choices, and as a follow-on there's Fifty Hikes in Vermont published by the Green Mountain Club (this one may be the same book WhiteMtHike is referring to).
Another little book I really liked when I was hitting the 111 hard was High Peaks of the Northeast by Bruce Scofield. Covers the NE plus the ADKs and Catskills. Condensed, pithy, a few maps were he felt appropriate - it's a little gem. Has some pointers I haven't seen elsewhere. My copy is dated 1993, so it's a bit out-of-date - but so far as know the mountains haven't moved (much).