USERY, E. L.; FINN, M. P.; STARBUCK, M. Data Layer Integration for The National Map of the United States. Cartographic Perspectives, [S. l.], n. 62, p. 28–41, 2009. DOI: 10.14714/CP62.183. Disponível em: https://cartographicperspectives.org/index.php/journal/article/view/cp62-usery-et-al. Acesso em: 29 mar. 2024.