REMOVE

1. Mining
2. Pictorial map

WHAT

1. Separate Map (5)
2. Agriculture (2)
3. Data Visualization (2)

WHERE

1. Nevada (2)
2. Virginia City (Nev.) (2)
3. Washoe (2)
4. New Zealand (1)
5. South Afirca (1)

WHO

1. Cooper, J.J. (2)
2. Edward Vischer (2)
3. Empire Marketing Board (2)
4. Gill, Leslie MacDonald, 1 … (2)
5. H.M. Stationery Office (2)

WHEN

1. 1861 (2)
2. 1929 (1)
3. 1931 (1)
4. 1968 (1)