Comments on MSRB Notice 2007-10 (March 5, 2007)

1. Bear Stearns and Co. Inc.: Letter from Daniel L. Keating, Senior Managing Director, dated May 9, 2007
2. CUSIP Service Bureau: Letter from Gerard Faulkner, Director of Operations, dated May 1, 2007
3. First Southwest Company: Letter from Richard A. DeLong, Managing Director, Municipal Trading and Underwriting, dated May 3, 2007
4. J.J.B. Hilliard, W.L. Lyons, Inc.: Letter from Lu Ann Vargo, Senior Vice President, Municipal Trader/Underwriter, dated April 4, 2007
5. Joe Jolly and Co., Inc.: Letter from Joe Jolly, Jr., dated May 3, 2007
6. Lehman Brothers: E-mail from Richard Sentochnik, Senior Vice President, dated May 3, 2007
7. Roosevelt and Cross, Inc.: Letter from Raymond J. O'Sullivan, Executive Vice President,
   dated April 30, 2007
8. Securities Industry and Financial Markets Association: Letter from Leslie M. Norwood, Vice President and Assistant General Counsel, dated May 9, 2007
9. Wiley Bros. Facsimile from Carrie Harris, dated May 3, 2007