Since we began our investigation into mass shootings following the attack in Aurora, Colorado, in July 2012, we've heard from numerous readers, academic researchers, legislative aides, law enforcement officials, and others wanting access to our full data set. Here it is below, including links to sources where available.
http://www.motherjones.com/politics/2012/12/mass-shootings-mother-jones-full-data
http://www.motherjones.com/politics/2012/12/mass-shootings-mother-jones-full-data