
    No. 82-1005.
    No. 82-1247.
    No. 82-1591.
    Chevron U.S.A. Inc. v. Natural Resources Defense Council, Inc., et al.; American Iron & Steel Institute et al. v. Natural Resources Defense Council, Inc., et al.; and Ruckelshaus, Administrator, Environmental Protection Agency v. Natural Resources Defense Council, Inc., et al.
   C. A. D. C. Cir. [Certiorari granted, 461 U. S. 956.] Motion of United Steelworkers of America, AFL-CIO-CLC, for leave to file a brief as amicus curiae granted.  