> From: Miserere
> > Does anybody know where/why the 5x7 size originated?
> 
> It's lost in the dim dark ages of history.
> 
> Predates photography, although before small format film and 
> film enlargers it would be the common size to contact print 
> from 5x7 glass plates and later from 5x7 negatives.
> 

The British Association of Paper Historians may be able to help:
http://www.baph.org.uk

Unless I've got completely the wrong end of the stick and it's a group of
historians made out of paper.

Bob


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