Holt, David Harms. (2002). Did extreme climate conditions stimulate the migrations of the Germanic tribes in the 3^rd and 4^th centuries AD? An examination of historical data, climate proxy data, and migration events. Doctoral thesis, Fulbright College of Arts and Sciences, Environmental Dynamics, The University of Arkansas at Fayetteville, Fayetteville, Arkansas (317 pp in 2 Volumes).