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Solnhofen quarrying pattern

<<Does anyone happen to know when the quarries were last active?>>

They are active, Phil.  (The new Archie wing was found in about February
2004.)  The lithographic press in the Burgermeister-Müller-Museum was
printing fine in December 2003 as well, and I imagine it still is.  The main
problem with the printing technique is economic.  It's relatively time