Rec. 630 (1907) (bill by Rep. Volstead ??reserving coal, lignite, petroleum, and natural-gas deposits from disposal . . . under existing land laws??); id., at 1483??1484 (bill by Sen. La Follette providing for the sale of surface lands, but ??reserving from entry and sale the mineral rights to coal and other materials mined for fuel, oil, gas, or asphalt??); id., at 1788 (bill by Sen. Nelson ??to