Hirschboeck, K. Anon.1975. The Response of Flooding in the Upper Mississippi Valley to Twentieth Century Climatic Fluctuations 1925-1969. Geography. Geography. University of Wisconsin.

Hirschboeck, K. Anon.1985. Hydroclimatology of flow events in the Gila River Basin, Central and Southern Arizona. Geosciences. Geosciences. University of Arizona. http://ezproxy.library.arizona.edu/login?url=http://proquest.umi.com/pqdweb?did=753278081&sid=23&Fmt=2&clientId=43922&RQT=309&VName=PQD.