Downloads a zip file containing a csv from the USDA website, imports it, cleans it and write two new csvs: USDA-tidy.csv containing a tidy dataframe of the data, and USDA-flowsheets.csv containing flowsheet info for the last five years, for importing into Excel.
Should be a link to the most recent USDA coffee zip file.
Also returns a dataframe called usda, which is loaded from the usda-tidy.csv using loadUSDA() under the hood.
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