The United States Senate Committee on Conservation of National Resources was established in 1909 and terminated in 1921. Chairmen of the Committee on Conservation of National Resources Joseph M. Dixon (R-MT) 1910-1913 Marcus A. Smith (D-AZ) 1913 James K. Vardaman (D-MS) 1913-1918 Ellison D. Smith (D-SC) 1918-1919 LeBaron B. Colt (R-RI) 1919-1921 Conservation of National Resources 1909 establishments in Washington, D.C. 1921 disestablishments in Washington, D.C. Nature conservation in the United States