אורן הזפת – הבדלי גרסאות

 

==לקריאה נוספת==

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* {{cite book | last1 = Chase| first1 = J. Smeaton| title = Cone-bearing Trees of the California Mountains | location = Chicago, Illinois | publisher = A. C. McClurg & Co. | page = 99 |year=1911 | oclc = 3477527|lccn=11004975}} with illustrations by Carl Eytel - [http://www.cslfdn.org/pdf/bulletin-95.pdf Kurut, Gary F. (2009), "Carl Eytel: Southern California Desert Artist", ''California State Library Foundation'', Bulletin No. 95, pp. 17-20] (PDF), retrieved November 13, 2011

*{{cite journal|last1=Wagener|first1=WW|year=1960|title=A comment on cold susceptibility of ponderosa and Jeffrey pines|journal=Madroño|volume=15|pages=217–219}}

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==קישורים חיצוניים==

*{{ויקישיתוף בשורה}}