Citation:

Earth Resources Observation and Science Center/U.S. Geological Survey/U.S. Department of the Interior. 1997. USGS 30 ARC-second Global Elevation Data, GTOPO30. Research Data Archive at the National Center for Atmospheric Research, Computational and Information Systems Laboratory. http://rda.ucar.edu/datasets/ds758.0/.

Literature information
Title USGS 30 ARC-second Global Elevation Data
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