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  1. By: Parker, M. W. (Marion Wesley), - Borthwick, H. A. (Harry Alfred),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1942
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Crop yields  Effect of light on  Plant photoperiodism  Plants
  2. By: United States. Agricultural Research Service.
    Publication info: [Washington, DC], Agricultural Research Service, United States Department of Agriculture, 1961
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Effect of light on  Growth (Plants)  Phytochrome  Plant photoperiodism  Plants  
  3. By: Perez-Garcia, Ponciano,
    Publication info: 1981
    Holding Institution: University of Florida, George A. Smathers Libraries
    Subjects: Agronomy  Agronomy thesis Ph. D  Dissertations, Academic  Genetics  Plant photoperiodism  Soybean  UF  
  4. By: Read, Ralph A., - Bagley, Walter Thaine, - Rocky Mountain Forest and Range Experiment Station (Fort Collins, Colo.)
    Publication info: Fort Collins, Colo, Rocky Mountain Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1967
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Conifers  Effect of light on  Forest nurseries  Growth  Plant photoperiodism  Plants  Seedlings