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  1. By: Alexander, R.R.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Alexander, R.R.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Alexander, R.R. - Shearer, R.C. - Shepperd, W.D.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library