Collecting Artifacts at Tlaxcallan (IMAGE) North Carolina State University Caption Archaeological researchers are shown collecting surface artifacts from the upper portion of Tlaxcallan. Credit John Millhauser Usage Restrictions Credit must be given 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.