As you may recall, Bill Henderson and I had a couple of posts expounding the virtues of the Sage monograph series on "Quantitative Applications in the Social Sciences" several weeks back. It is a great starter series (though expensive for the whole thing) for anyone looking to enter empirical research with or without a quantitative background. The library here at Minnesota has asked me to help build the collection of empirical and quantitative resource materials, and I am wondering whether anyone has any suggestions about "must have" books in the area? I have already recommended that the library order a number of selections, including from the Sage Series, but I don't want to miss any important books in the field. Your comments, as always, are most welcome.