A researcher here at Miami University (Ohio) is looking for access, especially digital access, to Sanborn maps showing the downtown area of San Francisco in the 1950s.  He provided an image of the specific area of interest, which I have attached as a PDF image with this message.

Anyone who is able to provide any assistance with this, please feel free to contact me directly via email.

I may be slow to reply in the next few days, and I have notified the researcher of this.  I will be attending the Depository Library Council meeting and conference next week.  That said, any assistance with access to mapping of this type for the area portrayed would be greatly appreciated.

Ken