The section is substituted for the source provision to eliminate obsolete words. The words “in existence on September 28, 1976” are added for clarity to show that the provision applies only to System units that were part of the System on that date.

The Mining Law of 1872, referred to in text, is act May 10, 1872, ch. 152, 17 Stat. 91, which was incorporated into the Revised Statutes of 1878 as R.S. §§ 2319 to 2328, 2331, 2333 to 2337, and 2344, which are classified to sections 22 to 24, 26 to 28, 29, 30, 33 to 35, 37, 39 to 42, and 47 of Title 30, Mineral Lands and Mining. For complete classification of such Revised Statutes sections to the Code, see Tables.