Patterson, Tom, and Nathaniel Vaughn Kelso. “Hal Shelton Revisited: Designing and Producing Natural-Color Maps With Satellite Land Cover Data”. Cartographic Perspectives, no. 47 (March 1, 2004): 28–55. Accessed July 22, 2024. https://cartographicperspectives.org/index.php/journal/article/view/cp47-patterson-kelso.