Subjects
- Cog railroads.1
- Communication devices.1
- Construction.1
- Copper mining.1
- Cotton.1
- Dams.1
- Death--United States--History--19th century.1
- Diesel locomotives.1
- Diplomats--United States--History--19th century.1
- Disasters.1
- Dogs--California.1
- Earthquakes--California--San Francisco.1
- Education.1
- Eiffel Tower (Paris, France)1
- Electricity.1
- Elevated railroads.1
- Emigration & immigration.1
- Engineers.1
- Engines.1
- Equipment industry.1