Description: Indexes journals important to historians and cultural scholars who study the U.S. and Canada.
To Find Book Reviews: Select "Book Review" from the "Document Type" box under "Limit Your Results." Search by author or title. Here's a little screencast.

Description: A broad, multi-disciplinary collection of the full text of scholarly journals with an emphasis on recent publications.
To Find Reviews: Do your search, then on the left-hand side of the result list use the "Content Type" box to limit to "Reviews."

Description: Indexes a broad range of scholarly and trade periodicals, including the New York Times Book Review and other such trade publications.
To Find Book Reviews: Select "Book Review" from the "Document Type" box under "Limit Your Results." Search by author or title.

Description: Access to thousands of newspapers, popular magazines, and trade publications, as well as scholarly journals.
To Find Book Reviews: Select "Review" from the "Document Type" box under "Limit Your Results." Search by author or title.