OPINION
WEIS, Circuit Judge.
The plaintiffs are operators of surface coal mines (strip mines) located in Western Pennsylvania at whose behest this Three-Judge Court has been convened to consider challenges to the constitutionality of the Federal Coal Mine Health and Safety Act of 1969, 30 U.S. C.A. § 801 et seq. Certain features of the Act and its administration have come under attack by the plaintiffs who allege that:...
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