50 C.F.R. § 27.52 Introduction of plants and animals.
Title 50 - Wildlife and Fisheries
Plants and animals or their parts taken elsewhere shall not be introduced, liberated, or placed on any national wildlife refuge except as authorized.
Title 50: Wildlife and Fisheries
PART 27—PROHIBITED ACTS
Subpart E—Disturbing Violations: Against Plants and Animals
§ 27.52 Introduction of plants and animals.

