WASHINGTON — The Municipal Securities Rulemaking Board released education guides Thursday aimed at helping municipal bond investors and issuers understand municipal market indices, yield curves and muni benchmark data.

The materials come two months after the MSRB announced it launched a broad review of muni indexes as part of an effort to improve the transparency of indexes. That review followed allegations of widespread manipulation by major banks of the London Interbank Offered Rate, or Libor.

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