Columbia subject headings:
Canon law--Concordances.
Gratian, active 12th century. Decretum Gratiani--Concordances.
Gratian, active 12th century. Decretum--Concordances.
Harvard subject headings:
Canon law--Concordances.
Catholic Church. Corpus juris canonici--Concordances.
Gratian, active 12th century. Decretum--Concordances.
Princeton subject headings:
Canon law--Concordances.
Gratian, active 12th century. Decretum--Concordances.