I have a series of Hubs based on the trenches of World War One and they get a lot of search traffic from schools and colleges as well as from people who are researching the war for other reasons.
Anyway to cut a long story short, I took those Hubs sorted them into chapters and made them into an ebook which is now available here on Amazon
It is easy to set up and easy to publish on kindle and best of all it is free to do so.
Another good thing that is an added bonus is that because it is in an ebook it will not be classed as duplicate content on Hubpages so it gives you more scope to make money from what you write.
Why don't you give it a try too, do you write poetry or recipe's or have a few Hubs in a series you should try it and see if it works for you.
you get 70% of every sale of your book and you get to make the price of your book.
My book is free today 27th of August for one day only so feel free to download it to give yourself an Idea of how your book could look.
Please leave some positive feedback on my Amazon page, for other readers to see, Thankyou.