Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Pretty much useless as field/pocket guide

I bough this pocket book and haven't found useful even once. In Internet age, this book renders itself pretty much useless. The book mainly has one pages with color photo of one of the deep sky objects and a very dry short description on the other page. That's pretty much about it. You can find all these photos on Internet in much better resolution or in the software like TheSky just by clicking on object. The accompanied description is just dry numerical tid-bits printed in font that discourages reading it. There are no constellation maps. You can find much better quality and interesting history, significance and field notes on Internet. May be this is not the authors fault. The description is supposed to be limited to that tiny page, what else they can do?