I'm guessing, but this story from the Post mentions aerial photos from 1937 (link to comparison shots) as part of a national agricultural surveying effort. Whether that related to the Agricultural Adjustment Administration I don't know, but in general this reminds us that data created by one bureaucracy can become useful in unexpected ways.
The contrast between the mostly farms of 1937 and the development now (this is well inside the Beltway) is striking.
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