Cohen, Dan2011-01-042011-01-042006-08-08https://hdl.handle.net/1920/6050Originally published by Dan Cohen on Dan Cohen's Digital Humanities Blog (www.dancohen.org). This work is licensed under a Creative Commons Attribution 3.0 United States License (http://creativecommons.org/licenses/by/3.0/us/).en-USArchivesGoogleMapsResearchTutorialsVisualizationArticle