A trial to determine whether BankAmerica Corp. mismanaged billions of dollars of California municipal bond funds got under way late Monday, with the bank insisting it has adequate records to prove its innocence.

A BankAmerica lawyer told San Francisco Superior Court Judge A. James Robertson that a massive accounting effort equivalent to more than 200,000 hours of labor will reveal how much unclaimed principal and interest the bank owes to the state and bond issuers.

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