EdwardS:
the large celt blade is 7" long, 2 1/2 " across the blade and is over 1/4" thick uniformly across the blade.  I got the measurements form papers describing North American artifacts of copper.  I can supply the source if you are interested.  
Yosemite Ben:  I need to PM you and ask about where to go/stay etc. for trip out west some day.  I would love to see your park and learn from you about resource use out there. 
thanks for looking guys.