<Tr> <Th> 4 digits </Th> <Td> 0 - 7000 - xxxx - x </Td> <Td> 0 - 8499 - xxxx - x </Td> <Td> 1,500 </Td> <Td> 1 - 4000 - xxxx - x </Td> <Td> 1 - 5499 - xxxx - x </Td> <Td> 1,500 </Td> <Td> 3,000 </Td> </Tr> <Tr> <Th> 3 digits </Th> <Td> 0 - 85000 - xxx - x </Td> <Td> 0 - 89999 - xxx - x </Td> <Td> 5,000 </Td> <Td> 1 - 55000 - xxx - x </Td> <Td> 1 - 86979 - xxx - x </Td> <Td> 31,980 </Td> <Td> 36,980 </Td> </Tr> <Tr> <Th> 2 digits </Th> <Td> 0 - 900000 - xx - x </Td> <Td> 0 - 949999 - xx - x </Td> <Td> 50,000 </Td> <Td> 1 - 869800 - xx - x </Td> <Td> 1 - 998999 - xx - x </Td> <Td> 129,200 </Td> <Td> 179,200 </Td> </Tr> <Tr> <Th> 1 digit </Th> <Td> 0 - 9500000 - x-x </Td> <Td> 0 - 9999999 - x-x </Td> <Td> 500,000 </Td> <Td> 1 - 9990000 - x-x </Td> <Td> 1 - 9999999 - x-x </Td> <Td> 10,000 </Td> <Td> 510,000 </Td> </Tr>

How might numbers such as the library of congress number or isbn number be used