[A Map Taken From a Mathematics Work Book] (open access)

[A Map Taken From a Mathematics Work Book]

A Mercator Projection of a map including Austin, San Antonio, Laredo, Victoria, and Corpus Christi on a grid with every line being 15 minutes.The magnetic variation is 10 degrees east, and the scale is 1:2,027,520.
Date: unknown
Creator: unknown
System: The Portal to Texas History