[CQ-Contest] What are the dates of WPX CW 2009

[KZ5D at aol.com]

WA7BNM lists May 30 and 31 as the dates for the CW WPX in 2009. I thought  it 
was always the 4th full weekend. Does anyone have the correct date?
 
73,
 
Art KZ5D
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