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1、 Social Security: Revisiting Benefits for Spouses and Survivors Updated September 21, 2021 Congressional Research Servic。

2、 https:crsreports.congress.gov Updated September 21, 2021Water Resources Development Acts: PrimerCongress often consider。

3、 An Overview of Rural Credit Markets September 21, 2021 Congressional Research Service https:crsreports.congress.gov R46。

4、 Social Security: The Trust Funds Updated September 21, 2021 Congressional Research Service https:crsreports.congress.go。

5、CRS Legal Sidebar Prepared for Members and Committees of Congress Legal SidebarLegal Sidebari i Addressing Environmental。