Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work.

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Default graphic shows hardness zonal changes 1990 - 2006

http://www.arborday.org/media/mapchanges.cfm

Don't know how true it is, but they are independent of the USA.

Martin
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