The Texas GLO generally did a fairly good job of compiling the Official County Maps showing the pattern of metes and bounds land grants covering each county. Typically, each county map was improved over time as the true picture of the patchwork of grants was refined. This is an interesting example of a part of the Official Dimmit County Map that presents a problem I've never seen before. The Official County Map entirely omitted one grant to which the State had issued a patent on what appears otherwise to be a valid survey. Existing GLO Map and this is what a correct compilation of the County Map from records on file in the GLO would look like: Revised GLO Map The revised map is my work. The Official County Map still looks like that in the upper image. You'll note that the Moritz Reissig Survey No. 592 all but disappears in the revised version of the map. It's a junior survey that was fieldnoted in the office to cover more land than was almost certainly there at the time. In my revision, I've left it to the GLO drafters to decide how they want to note the existence of the file associated with the survey when the GLO version of the map is corrected. The lesson to be drawn, I think, is that there's no substitute for actually examining the files, particularly when the Official County Map just looks odd.