Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A GREAT RESEARCH TOOL

This companion piece to Rovin's Encyclopedia of Super Heroes is a great research tool for pop culture scholars.The problem with this volume as opposed to the original is that it seems less complete.And some omissions are quite striking.For instance,there are listings for several Doc Savage villians like Carl Zolg and General Ino,but there is no listing for John Sunlight(the only pulp villian to match wits with the"man of bronze" more than once).There's also no listing for the Shadow's arch-foe Shiwan Khan.Still I guess this is a minor quibble.After all,how can you find too much fault with a book that has a listing for Mighty Mouse's arch-enemy Oil Can Harry?