The words are arranged within seven mini-dictionaries in word lengths of two to eight-letters, revealing the answers to a tricky clue at a glance. This unique format, combined with the dictionary's updated reference sections, including prime ministers and presidents, the zodiac and the Bible, the Classical world, astronomy, geography and more, guides the reader straight to the information needed to complete the puzzle. The first ever crossword was published in 1913 and Colonel Hill's first crossword dictionary was published in 1920. It has been in print for over seventy years, and is still an indispensable addition to the puzzle-solver's shelf.