Texas Digital Sanborn Maps (1867-1970) Map coverage from 1867-1970 provides academic and public libraries digital access to more than 660,000 large-scale maps of more than 12,000 American towns and cities. Sanborn maps are valuable historical tools for urban specialists, social historians, architects, geographers, genealogists, local historians, planners, environmentalists and anyone who wants to learn about the history, growth, and development of American cities, towns, and neighborhoods. They are large-scale plans containing data that can be used to estimate the potential risk for urban structures. This includes information such as the outline of each building, the size, shape and construction materials, heights, and function of structures, location of windows and doors.