While conducting some experiments with the Reuters collection, it was discovered\ud that contained within it were a number of documents that were exact duplicates of\ud each other (see Figure 1). A short study was conducted to try to discover how many\ud such documents there were. The results of this study revealed that the notion of a\ud duplicate document was not as simple as first thought.\ud \ud The contents of this report are as follows. A brief review of previous duplicate detection\ud research will be presented, followed by a description of the methods and results of\ud the duplicate detection work conducted here. In addition, there is an appendix holding\ud the document ids of the various types of duplicate found
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