Cataloged maps can be found in IUCat. Using the Advanced Search, change "All Fields" in the first row to "Subject" and type the name of the area you're interested in. Then, put "map" into the next row. You can also keywords about the kind of map your looking for, like "Geology" or "Interstate 69."
Be wary of limiting your search by "map" format. Many of our maps have not been encoded as such and will not show up if you select "map" as the format. Remember, add "map" as a keyword in your search.
Here's what a search for maps of Bloomington might look like.
You can always ask the staff of Government Information, Maps, and Microform Services for help finding maps.
E-mail libgimms@indiana.edu or call 812-855-6924.