404. That’s an error.

The requested URL /bookmarks/mark?op=edit&bkmk=http%3A%2F%2Fdata.bnf.fr%2F13177016%2Fpeter_hubner%2F&title=Peter+H%C3%BCbner+%28p%C3%A9dagogue%29 was not found on this server. That’s all we know.