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  1. By: Ruth, Robert H.
    Publication info: Portland, Or. :Pacific Northwest Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture,1970.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Effect of shade on  Forest ecology  Germination  Northwest, Pacific  Plants  Salmonberry  
  2. By: Cook, O. F. (Orator Fuller),
    Publication info: Washington :U.S. Dept. of Agriculture, Division of Botany,1901.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Coffee  Effect of shade on  Plants  
  3. By: Ryker, Russell A. - Potter, Dale R. - Intermountain Forest and Range Experiment Station (Ogden, Utah)
    Publication info: Ogden, Utah :U.S. Dept. of Agriculture, Forest Service, Intermountain Forest & Range Experiment Station,1970.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Douglas fir  Effect of shade on  Plants  Seedlings