"Omaha looked swell this morning out the train window," wrote John Vachon. "Very unspectacular, and ordinary looking, but definitely camera-challenging.
John Vachon wasn't from Nebraska, but he extensively photographed Omaha and Nebraska for the Farm Security Administration in late 1938. There are quite a few (sadly low quality) images of Nebraska available here on the Library Of Congress website.
The always excellent Shorpy has quite a few high resolution images by Vachon here.