Source File URL: www.cms.gov/Medicare/Medicare-Fee-for-Service-Payment/AcuteInpatientPPS/Downloads/FY_12_FR_County_to_CBSA_Xwalk.zip
Source Page: https://www.cms.gov/Medicare/Medicare-Fee-for-Service-Payment/AcuteInpatientPPS/FY-2012-IPPS-Final-Rule-Home-Page-Items/CMS1250507.html
NBER URL: http://www.nber.org/data/ssa-fips-state-county-crosswalk.html
Source: FY_12_FR_County_to_CBSA_Xwalk.xlsx workbook Sheet1 sheet
set up by Jean Roth , jroth@nber.org , 15 Dec 2016