REMOVE

1. Data Visualization
2. Separate Map
3. England

WHAT

1. Pictorial map (6)
2. Transportation (3)
3. Agriculture (2)

WHERE

1. London (England) (3)
2. Great Britain (1)
3. Ireland (1)
4. Scotland (1)

WHO

1. Gill, Leslie MacDonald, 1 … (6)
2. Dunstable & Watford (2)
3. Empire Marketing Board (2)
4. Eyre & Spottiswoode, Ltd. … (2)
5. H.M. Stationery Office (2)

WHEN

1. 1928 (4)
2. 1939 (1)
3. 1978 (1)