All leases issued under the provisions of § 7-31-38 shall be assignable in whole or in part, provided no assignment of less than a legal subdivision shall be recognized or approved by the said county. The term legal subdivision as used in this section shall be construed in its ordinary sense as used and recognized in the Bureau of Land Management of the United States. The assignment provided for herein shall be executed and acknowledged in duplicate in the manner prescribed for the conveyance of real estate in this state and subject to recording as other instruments conveying real estate, with like force and effect.
SDCL 7-31-40