Bibliography and Citations
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A new subspecies of Polygyra from Idaho. Nautilus. 44:121-122.
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1931. A new species of Hemphilia. Nautilus. 11:44.
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1897. The Idaho-Montana slug Magnipelta (Arionidae). Notulae Naturae. 262:2626pp..
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1954. Land Mollusca of North America (North of Mexico). Academy of Natural Sciences of Philadelphia Monograph. 3(1):1-573.
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1939. Land Mollusca of North America (north of Mexico), vol. 2. pt. 2. Academy of Natural Sciences of Philadelphia Monograph. 3(2):521-1113.
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1948. New American land shells. Nautilus. 16:30-33.
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1902. Notes on the anatomy of Oreohelix,—III, with descriptions of new species and subspecies. Proceedings of the Academy of Natural Sciences of Philadelphia. 85:383-410. Available from http://www.jstor.org/stable/4064181
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1933. A new species of Fluminicola. Nautilus. 21:75-76.
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1907. Land Mollusca of North America (north of Mexico), vol. 2, pt. 1. Academy of Natural Sciences of Philadelphia Monograph. 3(2):1-520.
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1946. Magnipelta, a new genus of Arionidae from Idaho. Nautilus. 67:37-38.
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1953. Species of Polygyra from Montana, Idaho, and the Pacific coast states. Proceedings of the Academy of Natural Sciences of Philadelphia. 80:177-186.
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1928. Notes on the anatomy of Oreohelix, -III, with description of new species and subspecies. Proceedings of the Academy of Natural Sciences of Philadelphia. 85:383-410.
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1934. Land Mollusca of North America (north of Mexico), vol. 1, pt. 2. Academy of Natural Sciences of Philadelphia Monograph. 3(1):575-994.
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1940. Western and southern Amnicolidae and a new Humboldtiana. Nautilus. 48:91-94.
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1935. A new American genus of Arionidae. Proceedings of the Academy of Natural Sciences of Philadelphia. 55:626-629.
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1903. [A new subspecies of Polygyra from Idaho]. Nautilus. 44:5,figs.8-10.
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1930. Notes on the anatomy of Oreohelix. II. Proceedings of the Academy of Natural Sciences of Philadelphia. 69:42-46.
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1917. Geographic Distribution of Pupillidae; Strobilopsidae, Valloniidae and Pleurodiscidae. In Manual of Conchology, Second series: Pulmonata. Volume XVIII.
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1934. Catalogue of the Amnicolidae of the western United States. Nautilus. 12:121-127.
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1899. Land Mollusca of North America (north of Mexico), vol. 1, pt. 1. Academy of Natural Sciences of Philadelphia Monograph. 3(1):1-574.
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1939. .
1996. Systematics of Mirabilis subgenus Quamoclidion (Nyctaginaceae). Madrono. 25(3):113-132.
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1978. Inter- and intrahabitat movements of the rough-skinned newt, Taricha torosa granulosa (Skilton). American Midland Naturalist. 63(2):470-496. Available from http://www.jstor.org/stable/2422806
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1960. Update on the environmental and economic costs associated with alien-invasive species in the United States. Ecological Economics. 52(2005):273–288. Available from http://www.sciencedirect.com/science/article/pii/S0921800904003027
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2005. Life on an intermittent edge. Trends in Ecology and Evolution. 8(2):45-46.
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