anchor.diff:     maptools_0.9-2.tar.gz \
      uuid_0.1-2.tar.gz \
      sp_1.2-5.tar.gz  \
  -   rappdirs_0.3.tar.gz \
  +   rappdirs_0.3.1.tar.gz \
      tigris_0.5.3.tar.gz \
      rappdirs_0.3.tar.gz \
      tidycensus_0.2.tar.gz 
  
positive.code:    https://mirrors.nics.utk.edu/cran/src/contrib/units_0.4-6.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/rgdal_1.2-8.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/rgeos_0.3-23.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/Archive/rappdirs/rappdirs_0.3.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/maptools_0.9-2.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/sp_1.2-5.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/uuid_0.1-2.tar.gz
  
negative.code:    units_0.4-6.tar.gz \
     rgdal_1.2-8.tar.gz \
     rgeos_0.3-23.tar.gz \
     rappdirs_0.3.1.tar.gz \
     maptools_0.9-2.tar.gz \
     uuid_0.1-2.tar.gz
     
  