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1、Congressional Research Service The Library of CongressCRS Report for CongressReceived through the CRS Web97877 AProperty。

2、 For a fuller discussion of the debate on the political status of Puerto Rico and the positions of1each political party,。

3、Congressional Research Service The Library of CongressCRS Report for CongressReceived through the CRS Web98190 EPWNatura。

4、Congressional Research Service The Library of CongressCRS Report for CongressReceived through the CRS Web97945 FNuclear 。

5、Congressional Research Service The Library of CongressCRS Report for CongressReceived through the CRS Web98549 GOVUpdate。