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Is there a department or agency in Iowa that keeps records of previous years' CSRs?

Abbreviated Question: 
Is there a department or agency in Iowa that keeps records of previous years' CSRs?
Answer: 

Iowa has updated the soil productivity system from Corn Suitability Rating (CSR) to Corn Suitability Rating 2 (CSR2) in 2013, and the USDA NRCS Web Soil Survey tool allows you to compute the new CSR2 for your farm (Google ISU Extension Ag Decision Maker information file C2-87). However, the USDA Natural Resource Conservation Service (NRCS) has historical records with CSR value for previous years.