iBook PDF collection accessability on iPhone and iPad ?

[lasllcap]

How do I make my PDF collection, currently viewable on iPhone iBook PDF collection, accessable/viewable on new iPad iBook PDF collection.
This must be an iCloud function which I dont understand.

Thanks,

 

[lasllcap]

Well, I figured it out; I just moved the files thru iTunes during a sync.
Its the obvious stuff that is the most elusive.
Seems like this is something that iCloud could handel tho.