To expand the boundaries of the Wallkill National Wildlife Refuge located in Sussex county, New Jersey, and to authorize appropriations for the acquisition of lands and waters located within such expanded boundaries.

Expands the boundaries of the Walkill National Wildlife Refuge located in Sussex County, New Jersey, to include the Mt. Laurel property-added lands (including any water and interest in such lands).

Authorizes Secretary of the Interior to make such minor modifications to the boundary of the Refuge as the Director of the U.S. Fish and Wildlife Service (USFWS) determines to be appropriate to: (1) achieve the goals of the USFWS relating to the Refuge; or (2) facilitate the acquisition of property within the Refuge.

Authorizes appropriations to the Secretary for the acquisition of such lands. Requires any land, water, or interest acquired by the Secretary pursuant to this Act to become part of the Refuge.