A photograph of Dr. Roberto Calderon, professor of history at the University of North Texas, seen through the stacks at the library. Only part of his face is visible; the rest is covered by books.
A photo of Dr. Roberto Calderon, professor of history at the University of North Texas, using his hands to add emphasis to his words by pointing to the left of the photo. Behind him are shelves of books. Part of a computer and other electronics are also visible.
A photograph of Dr. Roberto Calderon, professor of history at the University of North Texas, browsing books in the library. He stands in between two long shelves of books. In the background a person can be seen working on a computer.
Fotografía del Dr. Roberto Calderón, profesor de historia de la Universidad del Norte de Texas, en una oficina. El Dr. Calderón coloca un libro en una estantería. La habitación está llena de estantes con libros alineados con papeles. Una computadora y una impresora están encima del escritorio.
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