1966—Pub. L. 89–669 struck out one thousand acres limitation on acquisition of property, substituted prohibition against condemnation of lands within a one thousand-foot zone adjacent to either side of U.S. Highway Numbered 1 for the Key Deer National Wildlife Refuge for former prohibition against condemnation of lands on an island that is traversed at any point by U.S. Highway Numbered 1, and required cash equalization payment when making unequal exchanges of properties.