The Municipal Securities Rulemaking Board (MSRB) is a Congressionally
chartered, self-regulatory organization that ensures the integrity of
one of the country’s most important capital markets. Accessed for
centuries by state and local governments to finance trillions of dollars
in infrastructure projects, the municipal securities market is essential to
meeting the local needs of the nation’s residents.
MSRB has released an excellent report, Municipal Securities: Financing the Nation's Infrastructure, researching municipal debt, available on its website.