
    No. 75-510.
    No. 75-545.
    No. 75-1015.
    Flint Ridge Development Co. v. Scenic Rivers Association of Oklahoma et al., Hills, Secretary of Housing and Urban Development, et al. v. Scenic Rivers Association of Oklahoma et al., Ralston Purina Co. et al. v. Louisville & Nashville Railroad Co. et al.,
   426 U. S. 776;

426 U. S. 776; and

426 U. S. 476. Petitions for rehearing denied.

Mr. Justice Powell took no part in the consideration or decision of these petitions.  