REOPENING ON AUGUST 27Friday to Tuesday,
11 a.m. to 4 p.m.
(closed December 25)
Admission is always free!
2 Massachusetts Ave., N.E.
Washington, DC 20002
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.