Two Students with GPS Sled (IMAGE) NASA/Goddard Space Flight Center Caption Randall Bonnell (left), PhD student at Colorado State University, and Lucas Zeller (right), Master's student at Colorado State University, pull the GPR sled at Cameron Pass, Colorado. Credit Courtesy of Alex Olsen Mikitowicz. 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.