REMOVE

1. Coal
2. Mining
3. Covers
4. Geology
5. Pittman, E.F.
6. Dunstan, B.

WHAT

1. Atlas Map (1)
2. World Atlas (1)

WHERE

1. Belgium (1)
2. Netherlands (1)

WHO

1. Bar, I.C. (1)
2. Berghaus, H. (1)
3. Hubbe, H. (1)
4. Justus Perthus (1)
5. Reichard, C.G. (1)

WHEN

1. 1831 (1)
2. 1837 (1)