Columbia subject headings:
Eavesdropping--United States--Handbooks, manuals, etc.
Electronic surveillance--United States--Handbooks, manuals, etc.
Wiretapping--United States--Handbooks, manuals, etc.
Harvard subject headings:
Electronic surveillance--United States
Princeton subject headings:
Eavesdropping--United States--Handbooks, manuals, etc.
Electronic surveillance--United States--Handbooks, manuals, etc.
Wiretapping--United States--Handbooks, manuals, etc.