404. That’s an error.

The requested URL /bookmarks/mark?op=edit&bkmk=https%3A%2F%2Fdata.bnf.fr%2Fen%2F14853652%2Fadolphe_vaunois%2F&title=Adolphe+Vaunois+%2818..-18..%29 was not found on this server. That’s all we know.