I got 6 of the same book out of the library
I had to trim the covers a tiny bit so they could fit the books perfectly, this didn't cause any problem apart from I noticed the 'one flew over the cuckoo's nest' spine text was a bit too far to the left.
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Magazine covers -
I bought a magazine that fitted the larger/real scale magazine, however the other 5 I printed on a smaller scale for printing costs, and they are too small to mock up. The yearbook team said this isn't a problem,