Here are some resources to help you with your project
Make sure you log and capture information about your photos while doing your research. Capture:
Url to photo
Who the photo is attributed to
Find the licensing information about the photo. Your project is covered by educational use, but in the future, if you use images for commercial purposes you will have to pay attention to the license and use information.
The David Rumsey Map Collection was started over 35 years ago and contains more than 150,000 maps. The collection focuses on rare 16th through 21st century maps of North and South America, as well as maps of the World, Asia, Africa, Europe, and Oceania.