Columbia subject headings:
Privatization--Nigeria--Congresses.
Roads--Nigeria--Design and construction--Management--Congresses.
Roads--Nigeria--Maintenance and repair--Management--Congresses.
Harvard subject headings:
Privatization--Nigeria--Congresses.
Public-private sector cooperation--Nigeria--Congresses.
Roads--Nigeria--Design and construction--Management--Congresses.
Roads--Nigeria--Maintenance and repair--Management--Congresses.
Princeton subject headings: