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Believe: Books of Ezra and Nehemiah, Esdras I and Ii
This site contains introductions to both Ezra and Nehemiah with "General Information" and "Advanced Information" about the books from both a Catholic and Jewish perspective.
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Matthew Henry's Commentary: Ezra
An interesting overview of the book of Ezra given by Matthew Henry that first discusses the entire book and then includes a commentary on each chapter of the book.