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Submissions from 1968

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The 1967 Iowa corn yield test, M. T. Hillson and C. D. Hutchcroft

Submissions from 1967

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The 1966 Iowa corn yield test, M. T. Hillson and C. D. Hutchcroft

Submissions from 1966

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The 1965 Iowa corn yield test, R. L. Higgs, C. D. Hutchcroft, F. D. Williams, and M. T. Hillson

Submissions from 1965

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The 1964 Iowa corn yield test, C. D. Hutchcroft and R. L. Higgs

Submissions from 1964

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The 1963 Iowa corn yield test, R. L. Higgs, C. D. Hutchcroft, and J. L. Robinson

Submissions from 1963

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The 1962 Iowa corn yield test, C. D. Hutchcroft, R. D. Ingledue, R. L. Higgs, and J. L. Robinson

Submissions from 1962

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The 1961 Iowa corn yield test, C. D. Hutchcroft, R. D. Ingledue, and J. L. Robinson

Submissions from 1961

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The 1960 Iowa corn yield test, R. D. Ingledue, C. D. Hutchcroft, and J. L. Robinson

Submissions from 1960

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The 1959 Iowa corn yield test, C. D. Hutchcroft, J. L. Robinson, and R. D. Ingledue

Submissions from 1959

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The 1958 Iowa corn yield test, C. D. Hutchcroft and J. L. Robinson

Submissions from 1958

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The 1957 Iowa corn yield test, Charles D. Hutchcroft and Joe L. Robinson

Submissions from 1957

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The 1956 Iowa corn yield test, Charles D. Hutchcroft and Joe L. Robinson

Submissions from 1956

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The 1955 Iowa corn yield test, Charles D. Hutchcroft and Joe L. Robinson

Submissions from 1955

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The 1954 Iowa corn yield test, Charles D. Hutchcroft and Joe L. Robinson

Submissions from 1954

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The 1953 Iowa corn yield test, Joe L. Robinson and Charles D. Hutchcroft

Submissions from 1953

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The 1952 Iowa corn yield test, Charles D. Hutchcroft and Joe L. Robinson

Submissions from 1952

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The 1951 Iowa corn yield test, Joe L. Robinson and Charles D. Hutchcroft

Submissions from 1951

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The 1950 Iowa corn yield test, Charles D. Hutchcroft and Joe L. Robinson

Submissions from 1950

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The 1949 Iowa corn yield test, Joe L. Robinson and Charles D. Hutchcroft

Submissions from 1949

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The 1948 Iowa corn yield test, Charles D. Hutchcroft and Joe L. Robinson

Submissions from 1948

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The 1947 Iowa corn yield test, Joe L. Robinson and Charles D. Hutchcroft

Submissions from 1947

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The 1946 Iowa corn yield test, Charles D. Hutchcroft, Joe L. Robinson, and Francis Reiss

Submissions from 1946

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The 1945 Iowa corn yield test, Joe L. Robinson and Francis Reiss

Submissions from 1945

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The 1944 Iowa corn yield test, Francis Reiss and Joe L. Robinson

Submissions from 1944

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The 1943 Iowa corn yield test, Joe L. Robinson and Francis Reiss

Submissions from 1943

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The 1942 Iowa corn yield test, Francis Reiss, Joe L. Robinson, and Marcus S. Zuber

Submissions from 1942

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The 1941 Iowa corn yield test, Joe L. Robinson and Marcus S. Zuber

Submissions from 1941

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The 1940 Iowa corn yield test, Marcus S. Zuber and Joe L. Robinson

Submissions from 1940

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1939 Iowa corn yield test, Joe L. Robinson and Marcus S. Zuber

Submissions from 1922

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Iowa Corn Yield Test, Results of 1922 Tests, Plans for 1923 Tests, Iowa Corn and Small Grain Growers' Association; Farm Crops Section, Iowa Agricultural Experiment Station; and United States Department of Agriculture

Submissions from 1921

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Corn Yield Contest, 1921, Iowa Corn and Small Grain Growers' Association

Submissions from 1920

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Corn Yield Contest, 1920, Iowa Corn and Small Grain Growers' Association