Google Analytics provides many ways to track your content. One way is through the 'Content' tab, where you can access page views, average time on page, etc.
Referring to the screenshot below, after logging into your Google Anaytics account, select your profile/UA code to get to the reporting page. Then:
(1) Click on Content > Overview;
(2) If you want to drill down on a specific Flipbook or piece of content in your Hub, select Page. For your Flipbooks, you will see a list of Flipbook URLs (i/#####/#), while for your Hub you will see the Hub content URLs (/h/i/######-hub-item-title-goes-here);
(3) If want to drill down on a specific Title, click on Page Title and you will see a list of format "Title/Folder Name - Flipbook Name"; and
(4) At any time you can view a full report on #2 or #3 by clicking on View Full Report near the bottom right hand corner of the screen.