See industry description for sub-nodes below

L3	541810 Advertising Agencies
L3	541820 Public Relations Agencies
L3	541830 Media Buying Agencies
L3	541840 Media Representatives
L3	541850 Display Advertising
L3	541860 Direct Mail Advertising
L3	541870 Advertising Material Distribution Services
L3	541890 Other Services Related to Advertising

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