404. That’s an error.

The requested URL /bookmarks/mark?op=edit&bkmk=https%3A%2F%2Fdata.bnf.fr%2Fen%2F11291786%2Fmarie-francois-marc_bonnet%2F&title=Marie-Fran%C3%A7ois-Marc+Bonnet+%281899-19..%29 was not found on this server. That’s all we know.