Columbia subject headings:
Harvard subject headings:
Extremists--Germany--Handbooks, manuals, etc.
Extremists--Handbooks, manuals, etc.
Radicalism--Germany--Handbooks, manuals, etc.
Radicalism--Handbooks, manuals, etc.
Princeton subject headings:
Extremists--Germany--Handbooks, manuals, etc.
Extremists--Handbooks, manuals, etc.
Radicalism--Germany--Handbooks, manuals, etc.
Radicalism--Handbooks, manuals, etc.