In fiscal year 1997 and thereafter, the Indian Arts and Crafts Board may charge admission fees at its museums; charge rent and/or franchise fees for shops located in its museums; publish and sell publications; sell or rent or license use of photographs or other images in hard copy or other forms; license the use of designs, in whole or in part, by others; charge for consulting services provided to others; and may accept the services of volunteers to carry out its mission: Provided, That all revenue derived from such activities is covered into the special fund established by section 305c of this title.