Grayson County

Map of the Prairies and Lakes region covering Grayson County, Texas. Mercer's Colony Line is shown on the map. Scale ca. 1:133,334 (4000 varas per inch).
Date: December 29, 1853
Creator: Pressler, Charles W.
System: The Portal to Texas History

Karnes County

Map of Karnes County, Texas, including the South Texas Plains region. All but one county boundary is colored, as shown on map. Scale ca. 1:133,334 (4000 varas per inch).
Date: October 29, 1856
Creator: Von Rosenberg, W.
System: The Portal to Texas History

[Collin County]

Cadastral map of Collin County, Texas in the Prairies and Lakes region. Several features are marked including the Mercer Colony line. A legal statement is written in the lower-right corner attesting to the accuracy of the map.
Date: May 29, 1850
Creator: unknown
System: The Portal to Texas History