Anyone in the area of Washington, D.C.: The annual Stone Ridge Used Book Sale (four days, two and a half large gymnasiums filled with books and refilled as books are sold), held every spring for 46 years, will be ended after this year. This year (April 11-14, 2014) will be the very last, they say. I have found some treasures there in the past. I expect to be there this year, along with thousands of other people. (A websearch will find their website.)