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DescriptionFilter
Attachment
  
since 1986 once a year and in the last 8 years (2002 - present) almost twice a year
Attachment
  
since 1985 once a year and since 2002 twice a year
  
 
2002 to 2005 once a year
  
Summer 2005
  
 
Fall 2005
  
Spring 2008
  
once a year either Fall or Spring