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Subjects
- Suspension bridges.1
- Telegraph industry.1
- Telephone systems.1
- Textile industry.1
- Thanksgiving Day.1
- Thread industry.1
- Tool & die industry.1
- Transportation.1
- Trusses.1
- Tubular bridges.1
- United States--History--Civil War, 1861-1865.1
- Warships.1
- Water supply.1
- Waterworks.1
- Wills--Pennsylvania.1
- Women employees.1
- Woodwork.1
- Wool.1
- Yellow fever--Pennsylvania--Philadelphia.1