1950—Act Apr. 24, 1950, amended section generally to broaden the authority to permit performance of various kinds of work by the Forest Service, at the expense of interested parties, on national forests and other related lands.

Appropriation of all moneys received as contributions toward cooperative work under this section was made by acts Jan. 18, 1927, ch. 39, 44 Stat. 991; Mar. 26, 1934, ch. 89, 48 Stat. 483.

Classification as trust funds, appropriation and disbursement of funds appearing on books of Government as “Cooperative work, Forest Service,” see section 1321 of Title 31, Money and Finance.