_dta:
  1.  Census 2000 SF1 .do and .dct files are by Jean Roth , jroth@nber.org , 2012-11-08
  2.  Census 2000 SF1 notes are by Jean Roth , jroth@nber.org , 2012-11-08
  3.  by Jean Roth , jroth@nber.org , 11 Aug 2014
  4.  Census 2010 SF1 Summary Level 050
  5.  Unique identifier is county
  6.  Distances between County that are within 500 miles

county1:
  1.  County7, 8 COUNTY 3 30 A/N
  2.  001-507 County or equivalent area code
  3.  510-840 Independent city code

county2:
  1.  County7, 8 COUNTY 3 30 A/N
  2.  001-507 County or equivalent area code
  3.  510-840 Independent city code

  obs:     2,637,350                          
 vars:             3                          11 Aug 2014 10:13
 size:    47,472,300                          (_dta has notes)
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
              storage   display    value
variable name   type    format     label      variable label
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
county1         str5    %9s                 * County7, 8
mi_to_county    double  %10.0g                Distance between counties that are within 500 miles
county2         str5    %9s                 * County7, 8
                                            * indicated variables have notes
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Sorted by: county1  mi_to_county  county2