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HP Newsletter:
HP Solve: Issue 32 (September 2013)
HP Solve: Issue 31 (April 2013)
HP Solve: Issue 29 (October 2012)
HP Solve: Issue 28 (July 2012)
HP Solve: Issue 27 (April 2012)
HP Solve: Issue 26 (January 2012)
HP Solve: Issue 25 (October 2011)
HP Solve: Issue 24 (July 2011)
HP Solve: Issue 23 (April 2011)
HP Solve: Issue 22 (January 2011)
HP Solve: Issue 21 (November 2010)
HP Solve: Issue 20 (August 2010)
HP Solve: Issue 19 (June 2010)
HP Solve: Issue 18 (April 2010)
HP Solve: Issue 17 (February 2010)
HP Solve: Issue 16 (December 2009)
HP Solve: Issue 15 (October 2009)
HP Solve: Issue 14 (August 2009)
HP Solve: Issue 13 (June 2009)
HP Solve: Issue 12 (April 2009)
HP Solve: Issue 11 (February 2009)
HP Solve: Issue 10 (December 2008)
HP Solve: Issue 9 (October 2008)
HP Solve: Issue 8 (September 2008)
HP Solve: Issue 7 (August 2008)
HP Solve: Issue 3 (April 2008)