Helper function used by nhgis()
to read downloaded and unzipped codebook files obtained from NHGIS.org,
for US Census Bureau data from the American Community Survey (ACS).
Usage
nhgisreadcodebook(codebookfile, folder = getwd())
See also
nhgis()
which uses this, nhgisread()
for reading datafiles, get.acs()
, get.datafile.prefix()
, datafile()
, geofile()
, get.zipfile.prefix()