Experiment station record, Vol. 64 (January-June, 1931)

1931

Government Printing Office

Experiment station record, Vol. 65 (July-December, 1931)

1931

Government printing office

Experiment station record, Vol. 67 (July-December, 1932)

1932

Government printing office

Experiment station record, Vol. 73, no. 1-6 (July-December, 1935)

1935

Government printing office

Experiment station record, Vol. 76, no. 1-6 (January - June, 1937)

1937

Government printing office

Experiment station record, Vol. 79, no. 1-6 (July - December, 1938)

1938

Government printing office

Experiment station record, Vol. 77, no. 1-6 (July - December, 1937)

1938

Government printing office

Experiment station record, Vol. 78, no. 1-6 (January - June, 1938)

1938

Government printing office

Experiment station record, Vol. 81 (July-December, 1939)

1940

Government printing office

Experiment station record, Vol. 83 (July-December, 1940)

1941

Government printing office

Experiment station record, Vol. 82 (January-June, 1940)

1941

Government printing office