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<p>of noting the song, the publisher (book or recorded source), plus other fields, and crucially assigning a number to each song, including all variants (now known as the "Roud number") to overcome the problem of songs in which even the titles were not consistent across versions. The system initially used 3x5-inch filing cards in shoeboxes. In 1993, Roud implemented his record system on a <a href="page.php?w=computer_database">computer database</a>, which he continues to expand and maintain and which is now hosted on the website of the <a href="page.php?w=Vaughan_Williams_Memorial_Library">Vaughan Williams Memorial Library</a>.</p><p>
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