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List of contexts inside reports submitted by DREYFUS BASIC US MORTGAGE SECURITIES FUND

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Report: ck0000811789-20111231.xml or XBRLViewer

  1. Date: From May 1, 2012 to May 1, 2012

Report: ck0000811789-20101231.xml or XBRLViewer

  1. Date: From May 1, 2011 to May 1, 2011