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Resources Kral, Robert. Pinus resinosa . Flora of North America (FNA) 2 (Missouri Botanical Garden) –通过eFloras.org. Earle, Christopher J. (编). Pinus
（原始内容存档于2021-01-16）. Kral, Robert. Pinus lambertiana . Flora of North America (FNA) 2 (Missouri Botanical Garden) –通过eFloras.org. Earle, Christopher J. (编). Pinus
注释 "Robert Taylor." （页面存档备份，存于互联网档案馆） Films of the Golden Age. Retrieved: November 18, 2011. Wayne 2005, p. 165. Kral, E. A. "Robert Taylor of Beatrice:
Clinical Skin Samples Using Scanning Electron Microscopy. Janecek, Milos; Kral, Robert (编). Modern Electron Microscopy in Physical and Life Sciences. InTech
172 (2): 537–547. Bibcode:2004Icar..172..537K. doi:10.1016/j.icarus.2004.07.004. Kral, T. A.; Goodhart, T.; Howe, K. L.; Gavin, P. Can Methanogens