The following link leads to a list of AU's atlases. This isn't an exhaustive list, but should be fairly close. Adding search terms will narrow the list to find the geographical location or historical period you are looking for. Try terms like and be sure not to remove the search terms already present:
Atlases at AU. If you are unable to find an atlas for your topic at AU search the whole consortium by unchecking the AU box under locations on the left side of the page.
Interesting New Atlases