REMOVE

1. Coal mines and mining

WHAT

1. Canals (1)
2. Correspondence (1)
3. Great Britain--History--1 … (1)
4. Inland navigation--Great … (1)

WHO

1. Allanson, Shaw (1)
2. Bridgewater, Francis Henr … (1)

WHEN

1. 1789 (1)
2. 1812 (1)
3. 18th Century CE (1)