Bibliography and Citations
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1987. Types of vegetation in the semiarid portion of the United States and their economic significance. Journal of Agricultural Research. 28:99-128.
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1924. Ecogeographic variation in the American robin. Auk. 108:230-249.
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1988. Compaction and recovery of rangeland soils in the Owyhee Upland, Idaho. Journal of the Idaho Acadeny of Science. 30(1):49-54.
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1984. Dictionary of Plant Sciences. Oxford (United Kingdom): Oxford University Press.
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1987. Hybridization studies in the Aster occidentalis (Asteraceae) polyploid complex of western North America. Brittonia. 35(4):353-361.
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1983. Distribution patterns of North and Central American mayflies (Ephemeroptera). Mayflies and stoneflies: life histories and biology. Campbell IC, editor. New York: Springer. p. 155-167. Available from http://link.springer.com/chapter/10.1007%2F978-94-009-2397-3_20
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1990. A revision of the Genus Ephemerella (Ephemeroptera: Ephemerellidae) II. The subgenus Caudatella. Annals of the Entomological Society of America. 54(4):603-612.
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1961. A new classification of the subfamily Ephemerellinae and the description of a new genus. Pan-Pacific Entomologist. 60(3):245-247. Available from http://www.ephemeroptera-galactica.com/pubs/pub_a/puballenr1984p245.pdf
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1984. Morphological and cytological variation in the western North American Aster occidentalis complex (Asteraceae). Systematic Botany. 9(2):175-191.
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