404. That’s an error.
The requested URL /books?id=_5oPAAAAIAAJ&dq=editions:HARVARDAH4D1R&output=html&lr=&sitesec=reviews was not found on this server. That’s all we know.
/books?id=_5oPAAAAIAAJ&dq=editions:HARVARDAH4D1R&output=html&lr=&sitesec=reviews