Some Online Sanborn Maps

Sanborn maps of Missouri can be found here. Selected Sanborn maps of San Francisco can be found here.

ProQuest described the uses of Sanborn maps here.

Abbreviations used in the Sanborn maps and a map legend can be found here (from a .pdf file at the University of VA).

Case studies using Sanborn maps as well as other information at a site developed by a Kent State University professor can be found here.

Cyndislist.com has compiled a list of Fire Insurance Maps here.