404. That’s an error.

The requested URL /bookmarks/mark?op=edit&bkmk=https%3A%2F%2Fdata.bnf.fr%2Fen%2F16642903%2Fmichel_sogny_reminiscentiel%2F&title=R%C3%A9miniscentiel was not found on this server. That’s all we know.