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1、 The National Science Foundation: An Overview April 9, 2021 Congressional Research Service https:crsreports.congress.gov。

2、 COVID19 and Private Health Insurance Coverage: Frequently Asked Questions Updated April 9, 2021 Congressional Research 。

3、 The Law of Asylum Procedure at the Border: Statutes and Agency Implementation April 9, 2021 Congressional Research Serv。

4、 https:crsreports.congress.gov April 9, 2021Citizenship and Immigration Statuses of the U.S. ForeignBorn PopulationThe U。