This guide, also produced by the Sanborn Map Company, was intended to help professionals who might need to use the maps as a part of their jobs. In addition to information about the maps and their creation, it includes a history of the company.
This PDF guide, produced by Environmental Resources Incorporated, includes a comprehensive list of all Sanborn map abbreviations and symbols. It is a great quick-view resource for researchers of all levels.
Description and Utilization of the Sanborn Map by