43 U.S. Code § 1579 - Fish and wildlife habitat; mitigation of losses
Effective October 1, 1979, and to such extent and in such amounts as are provided in advance in appropriate  Acts, in order to provide measures determined by the Secretary of the Interior to be appropriated to mitigate loss of fish and wildlife habitat associated with other measures taken under this subchapter:
(a) Appropriation of funds; acquisition and disposal of lands; facilities undertakings; funds restriction for non-Federal facilities
The Secretary is authorized to—
 So in original. Probably should be “appropriation”.