If I am using Digital Sanborn Maps, how can I navigate to a different map?

If you are currently viewing thumbnails, the drop-down menus for city and date remain at the top of the screen:

User-added image
You can use these drop-down menus to change your map.

Additionally, you can begin a completely new search by clicking on the Browse Maps button located at the top left of the page:

User-added image
If you are no longer in thumbnail view, you can just click Close Window at the top left of the page:

User-added image

This will take you to the previous thumbnail page.