Schengen Information System - Wikipedia - The information system used to implement the Schengen treaty. Lists people who are undesirable, requested for extradition, missing persons, suspects, stolen documents, vehicles, etc...
Schengen Information System II - A study into the possibilities of producing and developing SIS II. Clarifies the functions and aims of SIS II.
A Tale of Two Cities - A Citypaper article about the reunification of Valga and Valka after Estonia and Latvia joined Schengen and the border was abolished.
BBC: Fanfare for bigger border-free EU - Celebrations herald the enlargement of the Schengen zone to include nine more EU countries. (December 20, 2007)
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