Topical Subjects
- Electric substations.1
- Electric transformers.1
- Electricity in mining.4
- Elevators.1
- Exhibitions--West Virginia--Morgantown.1
- Floods--Illinois--Harrisburg.1
- Floods.2
- Freight cars.38
- Gas-turbines.1
- Headframes (Mining)51
- Horses.4
- Loaders (Machines)13
- Loading and unloading.1
- Log transportation.1
- Longwall mining.2
- Machine shops.2
- Machinery.1
- Mine accidents.1
- Mine gases--Measurement.9
- Mine gases--Testing.1