Library of Congress Legislative Data Challenge THOMAS

^ gheen, tina (july 16, 2013). library of congress announces first legislative data challenge . library of congress. 
^ gheen, tina (september 10, 2013). second library of congress legislative data challenge launched . library of congress. 
^ gheen, tina (december 19, 2013). first legislative data challenge winner announced . library of congress. retrieved december 20, 2013. 
^ gheen, tina (february 25, 2014). jim mangiafico , garrett schure announced winners of second library of congress legislative data challenge . library of congress. retrieved february 25, 2014.