Electronic reading material? (1-4)

I believe the answer is:

e-book

'electronic reading material?' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for e-book that I've seen before include "Literature from the internet" , "Downloaded volume" , "Online publication" , "Non-paper publication" , "Electronic reading material" .)

I've seen this clue in The Guardian.

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