In recent years, United States agricultural trade has been at its highest level in history whether measured by volume or value. This report updates and revises the quantity indexes of U.S. agricultural trade previously published through fiscal year 1977 in various USDA publications including mainly the U.S. Foreign Agricultural Trade Statistical Reports, supplements to the bi-monthly FATUS. Besides the quantity indexes, covering the years 1866 through 1979, the study introduces price and value indexes as additional measures of the U.S agricultural trade performance for 1978 and 1979. The report supersedes Quantity Indexes of U.S. Agricultural Exports and Imports, ERS Foreign 253, Economic Research Service, February, 1969. The revision and update also includes a methodology which may be computerized.