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      Shortleaf research, newspaper articles, fact sheets, conference proceedings, literature reviews, and brochures.
     
    
    
    North America 
      Seeds of Woody Plants in North America: Revised and Enlarged Edition
    
    
    
    Young, J. A., Young C. G. (1992). Seeds of Woody Plants in North America: Revised and Enlarged Edition. Dioscorides Press, Portland  
      Softwoods of North America
    
    
    
    Alden, H. A. (1997). Softwoods of North America. Forest Products Laboratory, General Technical Report GTR-102.  Retrieved from 
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      Seeds of Woody Plants in North America: Revised and Enlarged Edition
    