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"This bulletin reports the results of the 1956 Iowa Corn Yield Test. The purpose of the report is to provide information to help Iowa farmers select hybrids best adapted for the area in which they live. The presentation of these results does not imply approval or endorsement of these hybrids by any of the cooperating agencies conducting this test." -- p. 3
"This bulletin is the report of the performance of corn hybrids tested at 24 locations in Iowa during the years 1955, 1956, 1957 and 1958. Summaries of 1-year, 3 year and four year periods are shown." -- p. 3