دانلود کتاب Touring the Universe through Binoculars: A Complete Astronomer's Guidebook (Wiley Science Editions)

I have several binoculars stargazing books e.g. Binocular Highlight by Gary Seronik, Stargazing with Binoculars by Robin Scagell and David Frydman, and this one by Philip S. Harrington, and this one is the worst among the three.
This book has no maps (star chart) so the novices don't know where to locate the objects, there's no sketch of DSO in binoculars view so the novices don't know what to expect to see in binoculars view, the photos are black and white, this book also enlist unnecessary DSO of his personal list (Harrington's), and this book discuss very little about making choice of binoculars, unlike the other two.

And I believe that some statements on this book are flaw. For example, it is stated on this book: "Both 7x35 and 7x50 binoculars offer up to a 10° to 12° field (page 44-45)" As far as I know, the widest field of 7x50 binos are 7 degree, not 10 degree.
"M57 (NGC 6720), the Ring Nebula, visible in binoculars? You bet! ... even through lightpolluted suburban skies, it is visible in 7x35 glasses as a faint, ever-so-slightly fuzzy "star". (page 174)" I had tried to locate M57 several times with my 10x50 bino but I can't detect any sign of it.