404. That’s an error.

The requested URL /bookmarks/mark?op=edit&bkmk=https%3A%2F%2Fdata.bnf.fr%2Fen%2F14865410%2Fmary_skeaping%2F&title=Mary+Skeaping+%281902-1984%29 was not found on this server. That’s all we know.