Related to the book review by Stephen Matthews on linked micromaps (Spatial Demography 2013 1(1):141-143), readers might be interested to know that there are two R packages now available to produce linked micromaps. Several colleagues and I at the EPA worked together to develop the micromap package. In that package, we describe how to produce linked micromaps for a variety of areal units, such as states, counties, districts, watersheds, etc. Dan Carr, Jim Pearson, and Linda Pickle developed the package micromapST to produce linked micromaps specifically for the 50 U.S. states and the District of Columbia. Both packages are available at the Comprehensive R Archive Network (CRAN: http://cran.rstudio.com/ ).