Subject
- Election districts7
- Natural gas6
- Power resources6
- Geology5
- Electric utilities4
- Great Britain—Colonies—Periodicals4
- Great Britain—Colonies—Registers4
- Railroads—Great Britain—Passenger traffic—Maps4
- Saint George's Channel (Ireland and Wales)—Maps4
- Wales—Maps—Early works to 18004
- Geology, Structural3
- Great Britain—Antiquities—Maps3
- Great Britain—History—Medieval period, 1066-1485—Maps3
- Railroads—British Isles—Maps3
- Roads—England—Maps—Early works to 18003
- Bus lines2
- Electric power2
- Electric power transmission2
- Electric power-plants2
- Great Britain—Historical geography—Maps2