downloaded saved geographic information for 5-year summary file ACS dataset ending in given year
Source:R/geo.R
      geo.RdSee get.read.geo(). This data set is a
geographic identifier file from the American Community Survey (ACS) 5-year summary file.
Format
A data.frame
'data.frame':	e.g., maybe 294334 obs. of 5  variables:  $ STUSAB  : chr  "AL" "AL" "AL" "AL" ... $ SUMLEVEL: chr  "140" "140" "140" "140" ... $ GEOID   : chr  "14000US01001020100" "14000US01001020200" "14000US01001020300" "14000US01001020400" ... $ FIPS    : chr  "01001020100" "01001020200" "01001020300" "01001020400" ... $ KEY     : chr  "al0004656" "al0004657" "al0004658" "al0004659" ...