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1、Congressional Research Service The Library of CongressCRS Report for CongressReceived through the CRS WebOrder Code RS22。

2、Congressional Research Service The Library of CongressCRS Report for CongressReceived through the CRS WebOrder Code RL32。

3、1 Act of December 28, 1973, P.L. 93205, 87 Stat. 884, as amended, codified at 16 U.S.C. 1531 et seq. Responsibility for 。

4、Congressional Research Service The Library of CongressCRS Report for CongressReceived through the CRS WebOrder Code RS22。