O?Rourke, Mary Kay. 1986. ?The Implications Of Atmospheric Pollen Rain For Fossil Pollen Profiles In The Arid Southwest?. Geoscience. Geoscience. University of Arizona. http://ezproxy.library.arizona.edu/login?url=http://proquest.umi.com/pqdweb?did=748690901&sid=6&Fmt=2&clientId=43922&RQT=309&VName=PQD.