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Spore and Pollen Images
Purves et al. Ch. 28 & 29
Trees of Reed College
Green Book, Section H: Statistics Explained
Eagle Fern Park
Lab Data Collector
Agrawal, A. 1998. Science 279: 1201-1202.
Paige & Whitham. 1987. American Naturalist 129(3) 407-416.