def download_crosswalk(filename):
crosswalk_url = "http://www.nber.org/cbsa-msa-fips-ssa-county-crosswalk/2011/FY%2011%20NPRM%20County%20to%20CBSA%20Xwalk.txt"
download_file(crosswalk_url, filename)
def download_gazetteer(gaz_file):
gaz_url = 'http://www.census.gov/geo/www/gazetteer/files/Gaz_counties_national.zip'
download_file(gaz_url, gaz_file)
def download_cbsa(filename):
cbsa_url = 'http://www.census.gov/population/metro/files/lists/2009/List4.txt'
download_file(cbsa_url, filename)
