Area Factbook
- Area-specific facts
- International:Country
- State
- State: Delaware
- State: District of Columbia
- Education
- History
- Media
- Transportation & Infrastructure
- State: Maryland
- Economics
- Government & Politics
- Health & medicine
- History
- Military bases
- National Guard: Maryland
- Telecommunications
- Transportation & Infrastructure
- State: Pennsylvania
- Transportation & Infrastructure
- State: Virginia
- Cities & towns
- Cities & towns: Maryland
- Cities & towns: Pennsylvania
- Cities & towns: Virginia
- Counties
- Counties: Maryland
- Counties: Virginia
- Demographic data (general)
- Economics (general)
- Geographical data
- Government & politics (general)
- Statistic & census data
- Transportation & infrastructure (general)
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