Columbia subject headings:
Portuguese language--Dialects--Portugal--Trás-os-Montes e Alto Douro--Dictionaries.
Portuguese language--Provincialisms--Portugal--Trás-os-Montes e Alto Douro--Dictionaries.
Harvard subject headings:
Portuguese language--Dialects--Portugal--Trás-os-Montes e Alto Douro--Dictionaries.
Portuguese language--Provincialisms--Portugal--Trás-os-Montes e Alto Douro--Dictionaries.
Princeton subject headings: