Arago: Exhibits

UP

Pony Express Stamps

United States Master Collection

80th Anniversary Pony Express Stamp

This stamps is a secondary source because it was issued in 1940; later than the period being studied.

Front

Overland Mail and Pony Express Commemorative Stamp

This stamp was issued in 1994, making it a secondary source too.

United States Master Collection, Scott 1154, Pony Express Centennial

100th Anniversary Pony Express Stamp

Is this a primary or secondary source? Explain.