Bradley, Raymond S. 1974. ?Secular Changes Of Precipitation In The Rocky Mountains And Adjacent Western States?. Geology And Geography. Geology And Geography. University of Boulder. http://ezproxy.library.arizona.edu/login?url=http://proquest.umi.com/pqdweb?did=758390521&sid=2&Fmt=1&clientId=43922&RQT=309&VName=PQD.

Moran, Joseph Micheal. 1972. ?An Analysis Of Periglacial Climatic Indicators Of Late Glacial Time In North America?. University of Wisconsin. http://ezproxy.library.arizona.edu/login?url=http://proquest.umi.com/pqdweb?did=759016511&sid=7&Fmt=1&clientId=43922&RQT=309&VName=PQD.

Reitan, Clayton Harold. 1971. ?An Assessment Of The Role Of Volcanic Dust In Determining Modern Changes In The Temperature Of The Northern Hemisphere?. University of Wisconsin. http://ezproxy.library.arizona.edu/login?url=http://proquest.umi.com/pqdweb?did=756913801&sid=8&Fmt=1&clientId=43922&RQT=309&VName=PQD.

Wendland, Wayne Marcel. 1971. ?Dating The Temporal Limits Of Climatic Episodes During The Holocene?. University of Wisconsin. http://ezproxy.library.arizona.edu/login?url=http://proquest.umi.com/pqdweb?did=758273691&sid=8&Fmt=1&clientId=43922&RQT=309&VName=PQD.