WSU Archaeologist Tim Kohler (IMAGE) Washington State University Caption Washington State University archaeologist Tim Kohler has documented a 40-year period of violence among the ancient pueblo people of southwest Colorado. Credit Washington State University photo Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.