The David Rumsey Map Collection is one of the premier collections of maps available online even though only a portion of this private collection has been digitized. You can access images in a variety of ways including Google Earth and Google Maps. However, if you are looking for images to download for teaching, launching the collection in the LUNA Browser is the best way to go. Tips for using the LUNA Browser are also provided. After finding an image you want, you can click on a thumbnail to bring up a larger image. Use the export button above the image to choose the size you want (small or medium will work well for PowerPoint). If you download the largest image size, you should be able to create your own details in any basic image editing software. To save groups of maps for future reference, you can create an account.