Linda,

In case your friend is not familiar with the Archives, be advised that the Research entrance is on Pennslyvania Ave., not the public Museum entrance on Constitution Ave.

See:

National Archives in Washington, DC
700 Pennsylvania Avenue, NW, Washington, DC 20408
Available services: Archival Research Room, Microfilm Research Room, "National Archives Experience" - The Rotunda, The Public Vaults, The William McGowan Theater, The Lawrence F. O'Brien Gallery,
https://www.archives.gov/locations/