I'm a huge fan of vintage maps, and San Francisco in particular captures my imagination. I have a ridiculous number of these floating around, thanks in part to my recent discovery of Schein and Schein in SF...the website doesn't do the place justice, you need to just go when you have an hour to kill, because there are some gems. If you don't want to drop $100+ on something that is over 100 years old, then ask for the Cheap Maps drawer. Here are a few good ones (click to view large):
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