I started learning Spanish a month ago and I am loving the Duolingo sessions but I am not always able to access online so I wondered if there were Duolingo books/phrase books. I have picked up a general phrase book but it just isn't the same.
if Duolingo don't do books maybe they should, I would definitely buy one.
I would definitely buy a Duolingo book too! Since that isn't possible at the moment, I'd suggest just checking out several Spanish books from a library or such, and seeing if any of those help you. Having other resources besides Duolingo is a big help.
There are no Duolingo books, as Katrina indicated.
You can write down the new sentences in a notebook. Then you'll have them to refer to whether you are at your computer or not. Writing out sentences will increase the time it takes to go through each lesson, but it has the advantage of getting you to spend a little more time studying each one, and writing out a thought by hand helps to fix it in your mind.