I cannot place these things on a wall or easel. I cannot take a flash at the Archives.

I do appreciate all the suggestions but think that all are missing my main point. Even with a wide angle lens I doubt that I can shoot these maps standing on the floor. This causes me to have to get up on the steps. Up there, I have to lean out with my arms to center over the maps and thus I cannot look through the view finder or even see the digital screen plainly enough to see if I am focused on the maps. I tried to take a clamp-on tripod to clamp the camera to the steps but this did not work as the image on the maps varied and I had to keep moving the things around. (way too much trouble when shooting over 300 maps). This is why I need to tether the camera to a monitor such as my MacBook Pro.