Strode, Georgianna, John Derek Morgan, Benjamin Thornton, Victor Mesev, Evan Rau, Sean Shortes, and Nathan Johnson. 2020. “Operationalizing Trumbo’s Principles of Bivariate Choropleth Map Design”. Cartographic Perspectives, no. 94 (January), 5-24. https://doi.org/10.14714/CP94.1538.