Downloaded iBook does not display, but fills memory on iPad

Our school provides iPads to the students. All are imaged identically. A teacher wrote a book and as iBook author made it available to his class. Half the students were able to download it. For the other half, the book did not download immediately so those students continued to tap download. The book never appeared but their iPad's memory filled up.

Since the iBook never appeared, we cannot remove it. How can we clear the memory for these phantom iBooks?
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Which version of the Ipad?
Which browser?
As each browser has an inbuilt delete temporary internet files and history
It could be in the TEMP files however
iClean - Remove and clean all the deleted temporary files from your iPhone, iPad or iPod
You meant the app iBook opened, and they couldn't download the book from the school server, correct?
Jackie ManCommented:
The only way to is remove the iBook app and restore iBook app from the Apps Store and reload all previously downloaded ebooks.
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SJCI_TechAuthor Commented:
We wound up reimaging the iPads.

The iBook app opened fine but for some students the downloading books stalled and would not continue and did not show up in Settings/General/Usage.  The MDM and Apple Configurator security do not easily allow student iPads to add in apps, such as iClean. If we were going to go through that, it was just as much work to redo the iPads.

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SJCI_TechAuthor Commented:
Reimaging the iPads clears the problem, it is just a lot of work
Seems a double jeopardy there SJCI_Tech
Good to know you found a hard solution nonetheless a solution
All the Best
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