_dta:
  1.  by Jean Roth , jroth@nber.org , 2012-10-05
  2.  by Jean Roth , jroth@nber.org , 2012-10-10

  obs:     8,262,363                          
 vars:             8                          15 Jun 2014 20:30
 size:   908,859,930                          (_dta has notes)
-------------------------------------------------------------------------------
              storage   display    value
variable name   type    format     label      variable label
-------------------------------------------------------------------------------
state           str2    %2s                   State (FIPS)
statename       str20   %20s                  State Name
county          str5    %9s                   County
countyname      str43   %43s                  County Name
tract           str6    %6s                   Census Tract
tractname       str20   %20s                  Tract Name
block           str4    %9s                   State FIPS + County FIPS + Tract
                                                + Block
blockname       str10   %10s                  Block Name
-------------------------------------------------------------------------------
Sorted by:  state  county  tract  block