What is the largest pdf file that iBooks can read?

I have two large maps (largest is 74MB).  They are in the iBooks library but when I try to display one, it thinks for about 10 seconds, then bombs back to the iBooks icon.  I have read a much smaller map pdf successfully.  So I'm thinking that I'm beyond iBooks' capacity.  Any thoughts?
Thanks

Apple suggests to iBook's authors to keep the size less than 2GB iBooks Author: iBooks Store publishing overview
You may have too many apps open which doesn't leave enough RAM to open.
You may have many apps open which can possibly cause the slowdown and possibly the loss of wifi. In iOS 4-6 double tap your Home button & at the bottom of the screen you will see the icons of all open apps. Close those you are not using by pressing on an icon until all icons wiggle - then tap the minus sign. For iOS 7 users, there’s an easy way to see which apps are open in order to close them. By double-tapping the home button on your iPhone or iPad, the new multitasking feature in iOS 7 shows full page previews of all your open apps. Simply scroll horizontally to see all your apps, and close the apps with a simple flick towards the top of the screen.
 Cheers, Tom

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