In furtherance of the purposes of the Act of March 4, 1931 (46 Stat. 1522), the
Secretary of the Interior is authorized to
acquire by purchase, exchange, donation, with donated
funds or otherwise by such means as he may deem to be in the public interest, lands and interests in lands adjoining or near the Fort Necessity National Battlefield site which in his discretion are necessary to
preserve the historic battleground, together with not to exceed 25 acres at the detached Braddock Monument: Provided, That the total
area acquired pursuant to
sections 430pp to 430tt of this title shall not exceed 500 acres, except that in order to avoid the undesirable severance of parcels in private ownership such parcels may be purchased in the entirety.