Reference statistics sampling dates for academic year 2010-2011:

July 25-July 31, 2011

Aug. 15-21, 2011

Sept. 12-25, 2011 (Gov doc reference statistics also collected)

Oct. 10-23, 2011

Jan. 2-8, 2012

Jan. 30-Feb. 12, 2012 (Gov doc reference statistics also collected)

Mar. 12-18, 2012

Mar. 26-Apr. 8, 2012

May 14-20, 2012

June 11-17, 2012