Columbia subject headings:
Freedom of information.
Information networks--Costs.
Information services--Fees.
Information services--Marketing.
Information storage and retrieval systems--Costs.
Library fines.
Harvard subject headings:
Fee-based library services.
Freedom of information.
Information networks--Costs.
Information services--Fees.
Information services--Marketing.
Information storage and retrieval systems--Costs.
Library fines.
Princeton subject headings:
Fee-based library services.
Freedom of information.
Information networks--Costs.
Information services--Fees.
Information services--Marketing.
Information storage and retrieval systems--Costs.