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Hoffman, Paul F., & Schrag, Daniel P. "The Snowball Earth." U of Harvard (1999) Retrieved on 29 Oct. 2004, from <http://www.eps.harvard.edu/people/faculty/hoffman/snowball_paper.html>.
The Snowball Hypothesis for Earth
Hoffman, Stanley, "Is There an International Order?" and "Liberalism and International Affairs" In Janus and Minerva by Stanley Hoffman. (Westview Press: London, 1987), p.395
Realism, Internationalism, and Liberalism
Hoffman, B. (1999, 30 June). An Educational Resource for the Learning, Researching, and Teaching of Theoretical Criminology. Retrieved December 8, 2005 from the World Wide Web: http://www.crimetheory.com/
Racist Crime in Light of Criminal Theory
Hoffman, William. "The Pharmacist as Statesman." The Doric Column. 3 April 2001. Online at < http://mbbnet.umn.edu/doric/humphrey.html>.
Third Class of Drugs
Hoffman, Katherine. An Enduring Spirit: The Art of Georgia O'Keeffe. Metuchen, NJ: The Scarecrow Press, 1984.
Georgia O'Keeffe
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