Phillips, III, J.A. wrote:

> The Oregon Historical Society does not allow direct photocopying of
> older ephemera in their research center--they lay down a thick sheet of
> what I believe is plexiglass between the copying bed and the papers.
> Apparently, they believe the plastic wedge is enough to break up the
> harmful exposure of the copier's lamp.
>
> If some one knows just what OHS is putting down (other than plexi) I'd
> like to hear about it. .
>
> Regards,
> John Phillips
OHS uses a pexiglas Ultra-Violet filter, its not just plain plexi.  Even
with this precaution, many of the older items and those with watercolors
can not be photocopied.