The Secretary shall not make, modify, or revoke any withdrawal created by Act of Congress; make a withdrawal which can be made only by Act of Congress; modify or revoke any withdrawal creating national monuments under the Act of June 8, 1906 (
34 Stat. 225;
16 U.S.C. 431–433); or modify, or revoke any withdrawal which added lands to the National Wildlife Refuge System prior to October 21, 1976, or which thereafter adds lands to that System under the terms of this Act. Nothing in this Act is intended to modify or change any provision of the Act of February 27, 1976 (
90 Stat. 199;
16 U.S.C.
668dd
(a)).