REMOVE

1. Covers
2. France
3. 1861

WHAT

1. Data Visualization (4)
2. Railroad (4)
3. Separate Map (4)

WHO

1. Minard, Charles Joseph, 1 … (4)
2. Regnier et Dourdet (4)

WHEN

1. 1859 (2)
2. 1860 (1)
3. 1862 (1)