The employment of romanization systems can become complex. For example, the English translation of Kubijovyč's "Ukraine: A Concise Encyclopædia" uses a modified Library of Congress (ALA-LC) system as outlined above for Ukrainian and Russian names—with the exceptions for endings or doubled consonants applying variously to personal and geographic names. For technical reasons, maps in the Encyclopedia follow different conventions. Names of persons are anglicized in the encyclopedia's text, but also presented in their original form in the index. Various geographic names are presented in their anglicized, Russian, or both Ukrainian and Polish forms, and appear in several forms in the index. Scientific transliteration is used in linguistics articles. The Encyclopedia's explanation of its transliteration and naming convention occupies 2-1/2 pages.