Sec. 191. Establishment; site; acquisition of land. 192. Omitted. 193. Administration of arboretum. 194. Advisory council. 195. Gifts, bequests, or devises for benefit of National Arboretum; separate fund in the Treasury. 196. Concessions, fees, and voluntary services. (a) In general. (b) Use of funds. (c) Acceptance of voluntary services.