Columbia subject headings:
Latin language--Phonology, Historical.
Proto-Indo-European language--Consonants.
Proto-Indo-European language--Phonology.
Harvard subject headings:
Latin language--Phonology.
Proto-Indo-European language--Consonants.
Proto-Indo-European language--Phonology.
Princeton subject headings:
Latin language--Phonology, Historical.
Proto-Indo-European language--Consonants.
Proto-Indo-European language--Phonology.