<Tr> <Td> Title 16 </Td> <Td> Conservation </Td> </Tr> <Tr> <Td> Title 17 </Td> <Td> Copyrights </Td> </Tr> <Tr> <Td> Title 18 </Td> <Td> Crimes and Criminal Procedure * </Td> </Tr> <Tr> <Td> Title 19 </Td> <Td> Customs Duties </Td> </Tr>

What is the difference between the code of federal regulations and the united states code