(b)The Secretary may at any time acquire the unexpired term of any lease or sublease issued or entered into pursuant to sections 47–2 to 47–6 of this title by purchase with funds available from the proceeds of leases, or with donated or appropriated funds, or by donation or exchange.
The Secretary of the Interior may enter into agreements with other Federal agencies and with any concessioner or its successor in order to effectuate the purposes of sections 47–2 to 47–6 of this title.