Reference 1: Age 25 and over and Age 25-29.
Reference 2: High school diploma or GED, Some college, Associate and/or bachelor's degree, Bachelor's degree, Master's and/or doctorate and/or professional degree, Doctorate and/or professional degree and Doctorate.
Source: http://en.wikipedia.org/wiki/Educational_attainment_in_the_United_States
Reference 2: High school diploma or GED, Some college, Associate and/or bachelor's degree, Bachelor's degree, Master's and/or doctorate and/or professional degree, Doctorate and/or professional degree and Doctorate.
Source: http://en.wikipedia.org/wiki/Educational_attainment_in_the_United_States
