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Usinger, RL (2004-09-01). Sierra Nevada Natural History. p. 20. ISBN 978-0-520-24096-4. Schoenherr, Allan A. (1992). A Natural History of California. University...

2nd ed, University of California Press, ISBN 0-520-24096-0, ISBN 978-0-520-24096-4, 439 pages C. Michael Hogan. (2008) Black Spruce: Picea mariana, GlobalTwitcher...

Berkeley, California: University of California Press. p. 40. ISBN 978-0-520-24096-4. Zeller SM, Smith AH (1964). "The genus Calvatia in North America"...

Robert Leslie (2004-09-01). Sierra Nevada Natural History. p. 20. ISBN 978-0-520-24096-4.  This article incorporates public domain material from "Vegetation...