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  1. Evaluation of El Dorado Pear for northeast growers and markets : optical measurements to determine harvest maturity, ripening changes, and eating quality of pears /
    By: Worthington, John T. (John Thomas), - United States. Science and Education Administration. Agricultural Research. Northeastern Region.
    Publication info: Beltsville, Md. :Agricultural Research (Northeastern Region), Science and Education Administration, U.S. Dept. of Agriculture,[1980]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
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  2. Quality sorting of red delicious apples by light transmission /
    By: Aulenbach, Barbara B. - Worthington, John T. (John Thomas), - Yeatman, John N. (John Newton),
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture, Agricultural Research Service,1972.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
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