Columbia subject headings:
Harvard subject headings:
Carthusians--France--Picardy--Correspondence.
Carthusians--France--Picardy--History--Sources.
Le Bret, Charles, 1598-1678--Correspondence.
Pecquius, Pierre-Antoine--Correspondence.
Princeton subject headings:
Carthusians--France--Picardy--Correspondence.
Carthusians--France--Picardy--History--Sources.