; and (B) interpreting the property for the public. (3) Cost-sharing requirement (A) Federal share The Federal share of the total cost of any activity carried out under a cooperative agreement entered into under this subsection shall be not more than 50 percent. (B) Form of non-federal share The non-Federal share of an activity carried out under a cooperative agreement entered into under this subsection may be in the form of donated property, goods, or services fairly valued. (4) Changes or alterations No changes or alterations shall be made to any property or project covered by a cooperative agreement entered into under paragraph (1) unless the Secretary and the other party to the agreement agree to the changes or alterations. (5) Conversion, use, or disposal Any payment by the Secretary under this subsection shall be subject to an agreement that the conversion, use, or disposal of a property or project for purposes contrary to the purposes of this section, as determined by the Secretary, shall entitle the United States to reimbursement in any amount equal to the greater of— (A) the amounts made available to the property or project by the United States; or (B) the portion of the increased value of the property or project attributable to the amounts made available under this subsection, as determined at the time of the conversion, use, or disposal. (h) Limited role of the Secretary Nothing in this section authorizes the Secretary to assume overall financial responsibility for the operation, maintenance, or management of the Historic District. 7135. Bows in parks (a) In general Chapter 1049 of title 54, United States Code (as amended by section 5101(a)), is amended by adding at the end the following: 104909. Bows in parks (a) Definition of not ready for immediate use The term not ready for immediate use means— (1) a bow or crossbow, the arrows of which are secured or stowed in a quiver or other arrow transport case