This is the largest combination library I've come up with.  It's huge!  The three of them once screwed together are just over 55".  That's a lot of library! It's a combination of two Flat Top Libraries and an Extra Tall Townhouse.  
 
The standard shelf configuration is two shelves in the Extra Tall Towhouse, one shelf in one of the Flat Tops, and no shelf in the other to accomodate the crazy tall books. You also have the option to add wood or asphalt shingles in the pull down menu.
 
This will ship in 3 boxes and the libraries will need to be screwed together.  Don't worry, I send the screws.  This setup will require a standard "Y" post. It'll be heavy!  I'll also be sending a board for the libraries to sit on for stability.