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Contact an archaeologist, the national park service, or your local historical preservation office. They should be able to point you in the right direction - aerial photography is used excessively in midwestern archaeology to find earthworks. Some of the archaeologists I worked with got some of their photos from the department of transportation.
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"Without passion man is a mere latent force and possibility, like the flint which awaits the shock of the iron before it can give forth its spark."
— Henri-Frédéric Amiel
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