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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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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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