How to invest in this market sell-off, according to a top fund that's survived every crash since 1929

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• When investors get antsy, managers of the 96-year-old Vanguard Wellington Fund strike.
• Sell-offs can put quality stocks on sale for dubious reasons.
• Here's the part of the market that a top-performing investor is targeting now.

In the last 96 years, the Vanguard Wellington Fund (VWELX) has been through it all.

Three months after its inception, what's now the third-longest-active mutual fund got rocked by the Wall Street crash of 1929, which...