Torget, Andrew J., 1978-; Mihalcea, Rada, 1974-; Christensen, Jon & McGhee, Geoff. Mapping Texts: Combining Text-Mining and Geo-Visualization To Unlock The Research Potential of Historical Newspapers. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc83797/. Accessed February 28, 2015.
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