Supplements 1-2 comprise v. 11 of the edition of the main work published in 10 v., 1946-l958. Supplement 9-< > has imprint: New York : Scribner ; Toronto : Maxwell Macmillan Canada ; New York : Maxwell Macmillan International. Supplement 9-<10 >: Kenneth T. Jackson, editor in chief. Includes bibliographical references and index.
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