- United States Engineer Office52
- Walker, Alfred C.49
- MTC48
- Navarro, Fernando46
- Powell, Susan46
- United States. Bureau of Public Roads44
- Schmidt, James J.42
- Minnesota Geological Survey40
- San Joaquin County, Community Development, Geographic Information Systems37
- Calaveras County GIS36
- McGill-Warner Co.35
- University of Chicago Library33
- L'Isle, Guillaume de, 1675-172632
- University of Iowa. Libraries. Map Collection31
- American Geographical Society of New York29
- MarinMap29
- Warner & Foote29
- Canada. Department of the Interior27
- Minneapolis (Minn.). City Engineers Office27
- Mitchell, S. Augustus (Samuel Augustus), 1792-186826