The farmers legislation -- Fulfilling the original mission : 1887-1940 -- War, prosperity, and the golden age of science : 1941-1961 -- Strengthening the planning process : 1961-1971 -- The paradox of success : 1972-1976 -- The new agenda institutionalized : 1977-1981 -- Restoration and rededication : 1981-1987 -- Legacy from the past ... promises for the future.