REMOVE

1. Topography
2. Historical
3. Statistical
4. Diagram

WHAT

1. Data Visualization (2)
2. Pictorial map (2)
3. Political (2)

WHERE

1. World (2)
2. Belgium (1)
3. Korea (1)

WHO

1. Denoyer-Geppert Company (2)
2. News Map of the Week, Inc … (2)

WHEN

1. 1949 (1)
2. 1950 (1)
3. Korean War (1)