Data Dictionary: ACS 2010 -- 2012 (3-Year Estimates)
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Data Source: U.S. Census Bureau
Table: B19313A. Aggregate Income In The Past 12 Months (In 2012 Inflation Adjusted Dollars) For The Population 15 Years And Over (White Alone) [1]
Universe: Universe: White alone population 15 years and over
Table Details
B19313A. Aggregate Income In The Past 12 Months (In 2012 Inflation Adjusted Dollars) For The Population 15 Years And Over (White Alone)
Universe: Universe: White alone population 15 years and over
Relevant Documentation:
Aggregate Income
Aggregate income is the sum of all incomes for a particular universe. Aggregate income is subject to rounding, which means that all cells in a matrix are rounded to the nearest hundred dollars. (For more information, see "Aggregate" under "Derived Measures.")

Excerpt from: Social Explorer; U.S. Census Bureau; American Community Survey 2012 3yr Summary File: Technical Documentation.
 
White
A person having origins in any of the original peoples of Europe, the Middle East, or North Africa. It includes people who indicate their race as "White" or report entries such as Irish, German, Italian, Lebanese, Arab, Moroccan, or Caucasian.