- Geos 220: Environmental History of the Southwest Fall 2001 Class times: T/TH 11:00-12:15 Location: CESL 102 Click on any topic to view: Professors and TAs Course Objectives and Summary Course Web Page Grading and Exams Attendance and Behavior Special Provisions Readings Writing Assignments Lecture Schedule Laboratory of Tree Ring Research University of Arizona Laboratory of Tree-Ring Research, ...www.ltrr.arizona.edu/geos220