Table 1. Historical Highlights: 1987 and Earlier Census Years-Con. 



[For meaning ol abbreviations and symbols, see introductory text) 



^Data are based on a sample of (arms. 



'Data for 1974 and prior years Include the value of forest products sold. 



3Data for 1982 and prior years exclude abnormal farms. 



*Data for 1959 are for $10,000 or more 



"Data for 1954 are for $25,000 or more. 



*Data for 1974 apply only to individual or family operations (sole proprietorship) and partnerships; see text. 



'Data for 1987 include cost of custom applications: data for agricultural chemicals exclude the cost of lime for 1987 and 1982. 



'Data for 1982 do not include imputation for item nonresponse. 



^Data for 1964 and prior years are for chickens 4 months old or older. 



8 IOWA 



1987 CENSUS OF AGRICULTURE-STATE DATA 



