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This content was originally published by MarketWatch.com - Top Stories. Original publishers retain all rights. It appears here for a limited time before automated archiving. By MarketWatch.com - Top Stories
A popular stock-market valuation measure is nearing the same level it hit just before the final two years of the most powerful bull markets of the 20th century -- if it breaks out again, prepare for the building, and the eventual bursting, of another bubble, warns a Wall Street veteran who called the market's rally off the March low.