Bing found the following results
A History of the Passport - National Geographic
Passport - Wikipedia
United States passport - Wikipedia
A Brief History of the United States passport - Indiana State Library
A brief history of the passport | Travel | The Guardian
Passport | Document, Travel & Security | Britannica
What year was the passport first used and why was it required? - HistoryNet
When Were Passports First Introduced? | HistoryExtra
How the U.S. Passport Evolved from Status Symbol to Essential Travel ...
The American Passport’s Historical Journey