In a message dated 9/13/2004 4:05:12 PM Eastern Daylight Time, [log in to unmask] writes: _http://www.geosociety.org/bookstore/default.asp?oID=0&catID=4&pID=PTS002_ (http://www.geosociety.org/bookstore/default.asp?oID=0&catID=4&pID=PTS002) These scales are great...! http://shop.optemize.com/shop/merchant.mv?Screen=CTGY&Store_Code=RedWop&Catego ry_Code=2594