(a) Pre-existing rights and permits
The enactment of this subchapter shall not affect adversely any valid rights heretofore existing, or any valid permits heretofore issued, within or relating to areas authorized for inclusion in the park.
(b) Issuance of permits by Secretary for use of park lands and utility, highway, and railway crossings
(c) Crossing by foot at designated locations; purposes; conduct
Authority is hereby granted for individuals to cross the park by foot at locations designated by the Secretary for the purpose of gaining access to the Potomac River or to non-Federal lands for hunting purposes: Provided, That while such individuals are within the boundaries of the park firearms shall be unloaded, bows unstrung, and dogs on leash.