"Cox" Row Zone-A Step Beyond, Cox, Inc. Advertisement, two pages, date unknown. |
Mangold, "Beyond Higher Yields And Less Errosion, Enter The Row Zone", Soybean Digest, Feb. 1987, p. 47. |
"They go underground for a better seedbed", Farm Journal, Mid-Mar. 1989, p. 18-P. |
"Yetter . . . for land's sake!", Yetter Manufacturing Company catalog, Nov. 1992. |
"Yetter No-Till Solutions", 1993-1994 The Yetter Catalog, Yetter Manufacturing Company. |
Fink, "Field trials test planter attachments", Farm Journal, Mid-Jan. 1993, pp. 10-15. |
Ernst, "Strip Preparation Could Heat Up The North", No-Till Farmer, Apr. 1993, pp. 8 and 9. |
Mangold, "Fertilizer Strips Aid Corn Growth", Soybean Digest, Oct. 1993, pp. a and d. |