Columbia subject headings:
Harvard subject headings:
French language--Dialects--France--Perche--Foreign elements--Italian.
French language--Dialects--France--Perche--Grammar.
French language--Dialects--France--Perche--Morphosyntax.
French language--Dialects--France--Perche--Phonetics.
Languages in contact--France--Perche.
Princeton subject headings:
French language--Dialects--France--Perche--Foreign elements--Italian.
French language--Dialects--France--Perche--Grammar.
French language--Dialects--France--Perche--Morphosyntax.
French language--Dialects--France--Perche--Phonetics.
Languages in contact--France--Perche.