I believe Steven Levitt used the Fatality Analysis Reporting System (FARS) from the national highway traffic safety administration (NHTSA) for his seatbelts vs

I believe Steven Levitt used the Fatality Analysis Reporting System (FARS) from the national highway traffic safety administration (NHTSA) for his seatbelts vs carseats work: ftp://ftp.nhtsa.dot.gov/fars/