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function to convert to/from U.S. State Plane Coordinates?

I am working in Linux.  

I clicked on the ESRI:102749 option on the spatialreference.org website that Rob referred to, and got a spec that looks like it should work inside CRS(), but something seems to be amiss.
Error in spTransform(pnw, CRS = CRS("+proj=lcc +lat_1=45.83333333333334 +lat_2=47.33333333333334 +lat_0=45.33333333333334 +lon_0=-120.5 +x_0=500000.0000000002 +y_0=0 +ellps=GRS80 +datum=NAD83 +to_meter=0.3048006096012192 +no_defs")) :
  load package rgdal for spTransform methods