 A similar thirteenth edition, consisting of three volumes plus a reprint of the twelfth edition, was published in 1926, so the twelfth and thirteenth editions were closely related to the eleventh edition and shared much of the same content.However, it became increasingly apparent that a more thorough update of the work was required.The fourteenth edition, published in 1929, was considerably revised, with much text eliminated or abridged to make room for new topics.