• Statistical determination of the response of apple trees to cultural methods 

    Winkler, A. J. (Albert Julius), 1894-1989 (University of Missouri--Columbia, 1918)
    Text from page 1: "Within recent years the subject of orchard tillage has come to be one of much interest to the fruit growers. It is only within the last few decades that tillage has been regarded as important. This may ...