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davidcyclebackMax, there is an inconsistancy here. Though the lower price is partially a reflection that these aren't stand alone posters or suppliments.
It is important to note that magazines were not stapled or otherwise bound. If one had a Harper's magazine he'd see its like a daily newspaper not a Time magazine or Reach guide. This means that many woodcuts can be displayed without tearing or cutting anything.
If this is an issue that is bothersome, the collector can purchase the whole publications or at least woodcuts where there hasn't been any cutting. The whole publications will be harder to find that the single woodcuts, but can be found.