Columbia subject headings:
Harvard subject headings:
French language--Dialects--France--Gravelines--Glossaries, vocabularies, etc.
French language--Dialects--France--Loon--Glossaries, vocabularies, etc.
French language--Dialects--France--Oye-Plage--Glossaries, vocabularies, etc.
Princeton subject headings:
French language--Dialects--France--Gravelines--Dictionaries.
French language--Dialects--France--Loon-Plage--Dicitonaries.
French language--Dialects--France--Nord-Pas-de-Calais.
French language--Dialects--France--Oye-Plage--Dictionaries.