Start with CLIO to find books and journals in Columbia University library collections. (Use the Educat catalog to find books and journals in the Teachers College Library.)
Then try WorldCat, the largest online catalog in the world, with over 100 million book and journal records.
To find dissertations, start with Proquest Digital Dissertations. Also check Dissertations & theses. UK & Ireland and DART, Europe's E-theses portal.
Other essential resources include:
One handy way to get an overview of scholarly literature on the subject of your research is to consult:
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