WASHINGTON - The Securities and Exchange Commission has asked roughly 30 major underwriting firms to detail their political contributions in the municipal area, market sources confirmed yesterday.

The commission is reviewing contribution practices to determine whether they are "consistent with the requirements of federal securities laws," one source said after reviewing a four-page letter the SEC sent last week asking underwriters for the information. The letters were signed by William McLucas, the SEC's enforcement chief, the source said.

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