You can delete the file of any downloaded publication from your device by doing the following:
Android
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Go to the Home or My books section of the application.
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Long press on the cover image of the desired publication until the option menu appears.
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Tap Delete from device.
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Confirm by taping OK.
iOS
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Go to the Home or My books section of the application.
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Long press on the cover image of the desired publication until the option menu appears.
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Tap Delete.
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Confirm by tapping Delete again.