They used to sell ~ten color-coded The HBR Guide to ABC (with the old logo). From what I see there is now an endless array of these but I'm not sure whether tho

They used to sell ~ten color-coded The HBR Guide to ABC (with the old logo). From what I see there is now an endless array of these but I'm not sure whether those are reprints or completely new books. They're also avail. as PDF on some special sites.