Digital Sanborn maps, 1867-1970. Texas Texas Digital Sanborn Maps provides access to large-scale historical maps of Texas towns and cities. Users have the ability to manipulate the maps, magnify and zoom in on specific sections. The maps, developed for fire insurance purposes, are frequently consulted as valuable historical tools for research into the history, growth, and development of urban areas. The large-scale maps provide information on building dimensions, street names, property boundaries, building uses, infrastructure elements, and much more. Multiple editions provide historical perspectives on growth and development. Dates of Coverage: Varies by city or town 1880s–1950s.