The document is an invitation letter from Samuel Sandoval Solis, an assistant professor at UC Davis, to Daniel Alejandro Gomez Martinez, a graduate student from Instituto Tecnologico de Estudios Superiores Monterrey, inviting him to join UC Davis as a visiting graduate student from January to June 2015. The letter acknowledges Daniel's interest in researching water resource planning and management focusing on Monterrey, Mexico and provides office space, but clarifies UC Davis will not provide financial support for Daniel's visit.