- General Soil Map, Armstrong County, Texas
- Map displays soil types along with creeks, towns, schools, churches, power transmission lines, oil and gas pipelines, roads, and railroads. Includes legend and symbols. texashistory.unt.edu/ark:/67531/metapth130271/
- General Soil Map, Runnels County, Texas
- Map displays soil types along with creeks, towns, schools, churches, power transmission lines, oil and gas pipelines, roads, and railroads. Includes legend and symbols. texashistory.unt.edu/ark:/67531/metapth224547/
- Soil Survey, Armstrong County, Texas
- Text describes the area, climate, agricultural history and statistics, soil-survey methods and definitions, soils and crops, land uses and agricultural methods, irrigation, and morphology and genesis of soils of Armstrong County, Texas. texashistory.unt.edu/ark:/67531/metapth130197/