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...Hooper in New York City were added to the 29 volumes of the 11th edition, which then became the 12th edition. In 1926 three wholly new supplementary volumes, edited by Hooper in New York City and J.L. Garvin in London, became the 13th edition. During this period (1923–28) ownership shifted from Sears, Roebuck to Hooper’s widow and his brother-in-law, William J. Cox.
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