The "5.8 k.txt" reference, or "5.8k.txt," corresponds to an external text commentary in the "Milestones in the History of Thematic Cartography, Statistical Graphics, and Data Visualization" project by Michael Friendly and Daniel J. Denis. Within this database, such TXT files provide deeper context for significant historical milestones, including early maps like the Konya town layout. Read the full project documentation and explore the "5.8 k.txt" file at the Gallery of Data Visualization .