County polygons from: Siczewicz, Peter. U.S. Historical Counties (Generalized .001 deg). Dataset. Emily Kelley, digital comp. Atlas of Historical County Boundaries, ed. by John H. Long. Chicago: The Newberry Library, 2011. Available online from http://publications.newberry.org/ahcbp
1 2 3 4 5 | names(histCounties@data)
## Not run:
plot(histCounties[which(histCounties@data$STATE_TERR == "New Jersey"),])
## End(Not run)
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