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1、1 Memorandum on the Prohibition on Federal Funding for Cloning of Human Beings, 33 WeeklyComp. Pres. Doc. 281 March 4, 1。

2、Congressional Research Service The Library of CongressReport for CongressReceived through the CRS WebOrder Code RL31615H。

3、Congressional Research Service The Library of CongressCRS Report for CongressReceived through the CRS WebOrder Code RS21。

4、Congressional Research Service The Library of CongressReport for CongressReceived through the CRS WebOrder Code RL31492H。