R (>= 2.10), maptools, sp, foreign, methods, grDevices, base,
stats, utils, UScensus2000tract, UScensus2000cdp, gpclib, XML,
UScensus2000
R (>= 2.10), maptools, sp, foreign, methods, grDevices, base,
stats, utils, UScensus2000blkgrp, UScensus2000tract,
UScensus2000cdp, gpclib, XML, UScensus2000