Columbia subject headings:
Espionage, Russian--Washington (D.C.)
Public buildings--Security measures--Washington (D.C.)
United States. Department of State--Buildings--Security measures.
Harvard subject headings:
Espionage, Russian--Washington (D.C.)
Public buildings--Security measures--Washington (D.C.)
United States. Department of State--Buildings--Security measures.
Princeton subject headings:
Espionage, Russian--Washington (D.C.).
Public buildings--Security measures--Washington (D.C.).
United States. Department of State--Buildings--Security measures.