Supply pressures and mutual fund selling continued to take their toll on municipal bond prices, pushing yields of The Bond Buyer's indexes higher for the fourth consecutive week and to their highest levels since May.

The 20-bond index of general obligation yields rose nine basis points, to 6.62% from 6.53% last week, and the 11-bond index rose 11 basis points, to 6.53% from 6.42%.

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