REMOVE

1. Data Visualization
2. Separate Map
3. 1861

WHAT

1. Railroad (8)
2. Covers (5)
3. Statistical Diagram (5)

WHERE

1. France (8)
2. World (2)
3. Nevada (1)
4. Unted States (1)
5. Virginia City (Nev.) (1)

WHO

1. Cooper, J.J. (1)
2. Edward Vischer (1)
3. Henry S. Graham (1)
4. Hergesheimer, Edwin (1)
5. Leonhardt, Th. (1)
6. Minard, Charles Joseph, … (10)
7. Nagel, Fishbourne & Kuche … (1)
8. Regnier et Dourdet (10)
9. U.S. Coast and Geodetic S … (1)
10. Vischer, Edward (1)

WHEN

1. 1859 (4)
2. 1862 (4)
3. 1860 (2)
4. U.S. Civil War (2)