"The Times" had an average daily circulation of 417,298 in January 2019. In the same period, "The Sunday Times" had an average weekly circulation of 712,291. An American edition of "The Times" has been published since 6 June 2006. "The Times" is often used by scholars and researchers because it is a reliable source, it is in many libraries and has a detailed index. A complete historical file of the digitised paper, up to 2010, is online from Gale Cengage Learning.