Roget's 21st century thesaurus in dictionary form Roget's 21st century thesaurus in dictionary form - Canada A Dell Book 2005 - 962 pages ; 18 x 11 cm. Includes concept index. ISBN: 978-0-440-24269-7 Subjects--Topical Terms: English langauge--Synonyms and antonyms. Dewey Class. No.: 423.1 R732 2005