The FRED series Municipal Securities - Assets - Balance Sheet of Households and Nonprofit Organizations is now known as Households and Nonprofit Organizations; Municipal Securities and Loans; Asset.
The source series id is FL153062005.Q.
This series appears in Table B.101. For further information see the assistance provided in the guide to the Financial Accounts at http://www.federalreserve.gov/apps/fof/.
Board of Governors of the Federal Reserve System (US), Households and Nonprofit Organizations; Municipal Securities and Loans; Asset, Level [MSABSHNO], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/MSABSHNO, January 16, 2018.