John Deere's Steel Plow

by Edward C. Kendall

[3] Ibid., p. 16.

[4] J. B. Davidson, "Tillage machinery," in L. H. Bailey's Cyclopedia of American agriculture, New York, 1907, vol. 1, p. 389.

[5] Leo Rogin, The introduction of farm machinery in its relation to the productivity of labor in the agriculture of the United States during the nineteenth century, Berkeley, 1931, p. 33.

[6] U. S. National Museum records under accession 148904.

[7] Neil M. Clark, John Deere, Moline, 1937, pp. 34, 35.

[8] Stewart H. Holbrook, Machines of plenty, New York, 1955, pp. 178, 179. To an inquiry by this author, Mr. Holbrook replied that most if not all of the material about Andrus came from the files of the J. I. Case Company.

[9] Photographic copies of partnership agreements between Andrus, Deere, and others are in U. S. National Museum records under accession 148904.

[10] Ibid.

[11] Ibid.

[12] Letter from Burton F. Peek to M. L. Putnam, December 18, 1957, in U. S. National Museum records under accession 148904.