Naval petroleum reserves. For protection of oil lands on former naval reserves, supplemental estimate of appropriation, fiscal year 1929, to remain available until June 30, 1930, to enable the Chief Executive to continue litigation in connection with joint resolution directing Secretary of Interior to institute proceedings touching sections 16 and 36, township 30 south, range 23 east, Mount Diablo meridian [within exterior limits of naval reserve numbered 1 in California].