 |
 |
|
 |
|
 |
42 (XLII) — 1931-1932
U.S. Accident Rate, 240.
U.S. Coal Statistics, 88.
Underground Arches, 64.
Underground Bires, 415.
Underground Lighting, 233, 235, 261, 280, 299, 304.
Under-manager's Duties, 286.
Union is Strength, 376.
Union, Reorganisation, 409.
Unique Incident, 149.
University of Sheffield Report, 332.
Unusual Circumstances of Explosion, 171.
Upcast Shaft, Enclosing, 32.
Use of Explosives, 67, 73, 356, 392, 408.
Uses, Coal, 107, 391.
Contains public sector information licensed under the 
