<Tr> <Td> 12 </Td> <Td> Human or animal blood </Td> <Td> 18,865 </Td> </Tr> <Tr> <Td> 13 </Td> <Td> Aircraft parts </Td> <Td> 17,013 </Td> </Tr> <Tr> <Td> 14 </Td> <Td> Coal </Td> <Td> 16,277 </Td> </Tr> <Tr> <Td> 15 </Td> <Td> Telephones </Td> <Td> 13,479 </Td> </Tr>

What are some products that the united states imports