<Tr> <Td> Colorado guide meridian </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> Utah </Td> </Tr> <Tr> <Td> Columbia guide meridian </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> Washington </Td> </Tr> <Tr> <Td> Colville guide meridian </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> Washington </Td> </Tr> <Tr> <Td> Coulson guide meridian </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> Montana </Td> </Tr>

Map of principal meridians and base lines in the united states