Today, in incredibly awesome things made available by the internet, a new(ish) website  called Vintage Aerial provides access to over 5 million photos, taken in 41 states over the second half of the twentieth century.
Looking to find an aerial photograph of a specific farm, homestead, or rural township? The librarians at the site are nearly positive that they can find it for you, and for no cost! Prints of the photographs are then made available.
Just looking to browse the visual rural history of this country? Many of the prints are available to view online-- many accompanied by stories from current or previous owners.