Sanborn Digital Maps: New Mexico This link opens in a new windowProQuest's Digital Sanborn Maps, 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 fire insurance maps are the most frequently consulted maps in both public and academic libraries. 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.