Open daily 10 a.m. to 5:30 p.m.
Admission is always free!
2 Massachusetts Ave., N.E.
Washington, DC 20002
The museum's main entrance is located on the corner of First Street and Massachusetts Avenue NE. Other entrances have variable hours.
This stamps is a secondary source because it was issued in 1940; later than the period being studied.
This stamp was issued in 1994, making it a secondary source too.
Is this a primary or secondary source? Explain.