The data are drawn from the National Agricultural Statistics Service (NASS). The NASS is the statistics branch of the US Department for Agriculture and conducts hundreds of surveys each year on issues relating to agricultural production, demographics and the environment. As part of this mission the NASS administers an annual survey of crop yields, output, and acreage in each county. As in Butler and Cornaggia (2011), I proxy productivity using crop yield (tons produced per acre). I therefore have annual information on productivity and acres planted for several industries (sugar beet, corn, wheat, and barley) in each US county over the period 1965–1985. Information on the price received for each crop is also available from the NASS, albeit at the state level. A summary of the data is reported